How many questions from Aldehydes and Ketones appear in JEE?

Aldehydes and Ketones has appeared in 135 of the last 186 JEE Main and JEE Advanced papers — about 73% of them — contributing 199 questions in total across those papers.

Is Aldehydes and Ketones an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 73% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Aldehydes and Ketones questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

Aldehydes and Ketones JEE Previous Year Questions with Answers

Q1·ChemistryMultiple correctJEE Advanced 2026

In the following reaction sequence, Q, R, S and T are the major products. The correct statement(s) about Q, R, S and T is(are)

(A)S on warming with ammoniacal $\mathrm{AgNO_3}$ results in the formation of silver mirror.
(B)Q on treatment with $\mathrm{Cl_2}$ (excess)/UV gives gammaxane.
(C)T is a heterocyclic compound.
(D)R on acid catalyzed intramolecular cyclization followed by treatment with Zn-Hg/HCl gives 9,10-dihydroxyanthracene.

Q2·ChemistrySingle correctJEE Advanced 2026

The List-II contains products obtained from the reaction of compounds in List-I with

\mathrm{O_3/Zn}

-

\mathrm{H_2O}

followed by cyclization (via more stable enolate) in the presence of aqueous NaOH. Match each entry in List-I with appropriate entry in List-II and choose the correct option.

(A)P ⟶ 2; Q ⟶ 4; R ⟶ 1; S ⟶ 3
(B)P ⟶ 3; Q ⟶ 4; R ⟶ 5; S ⟶ 2
(C)P ⟶ 2; Q ⟶ 1; R ⟶ 5; S ⟶ 3
(D)P ⟶ 3; Q ⟶ 5; R ⟶ 4; S ⟶ 2

Q3·ChemistrySingle correctJEE Advanced 2026

Natural rubber on complete ozonolysis (

O_{3}/Zn-H_{2}O

) gives compound X as the major product. X gives positive iodoform and Tollen's tests. X on heating with aqueous NaOH gives Y as the major product. Y is

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q4·ChemistryNumericalJEE Main 2026

'

x

' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. '

y

' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous

AlCl_3

. Product (major) obtained by heating

x

and

y

in the presence of alkali is

z

. Total number of

\pi

(pi) electrons in

z

is __________.

Q5·ChemistrySingle correctJEE Main 2026

An optically active alkyl bromide

\mathrm{C_{4}H_{9}Br}

, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at 333 K to form compound [D]. The functional group in compound D will be confirmed by :

(A)Haloform test
(B)Lucas test
(C)Silver mirror test
(D)Benedict test

Q6·ChemistrySingle correctJEE Main 2026

'

x

' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. '

y

' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from '

x

' and '

y

' in the presence of barium hydroxide followed by heating is :

(A)2-Methylpent-4-en-3-one
(B)4-Methylpent-3-en-2-one
(C)4-Methylpent-1-ene
(D)2-Methylpent-3-one

Q7·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I: The condensation reaction between CH₃ − CH = O and H₂N − NH − C(= O) − NH₂ under optimum pH will produce CH₃ − CH = N − N(H) − C(= O) − NH₂. Statement II: The molecule, Ph − CH(O − H)(O − CH₃) will generate Ph − CH = O in the presence of dilute acid. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q8·ChemistrySingle correctJEE Main 2026

An organic compound "

x

" where molar ratio of C, O and H are equal, on treatment with 50% KOH under reflux followed by acidification produced "

y

". The most likely structure of "

y

" is: [Molar mass of '

x

' is 58 g mol

^{-1}

]

(A) $CH_2 = CH - \overset{O}{\overset{||}{C}} - OH$
(B) $CH_3 - CH = CH - CH = O$
(C) $O = C - OH, CH_2 - OH$ (with C-C bond)
(D) $CH_3 - \overset{O}{\overset{||}{C}} - OH$

Q9·ChemistrySingle correctJEE Main 2026

A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z). A. Both (Y) and (Z) have same molar mass. B. (Y) and (Z) can be distinguished from each other by

NaHCO_3

. C. (Y) and (Z) react with HCN with same rates. D. (Y) and (Z) undergo addition reaction with 2,4-DNP. Choose the correct answer from the options given below:

(A)A, B and C Only
(B)B and C Only
(C)C and D Only
(D)A and D Only

Q10·ChemistrySingle correctJEE Main 2026

Given below are the four isomeric compounds (P, Q, R, S) Identify correct statements from below. A. Q, R and S will give precipitate with 2, 4 - DNP. B. P and Q will give positive Bayer's test. C. Q and R will give sooty flame. D. R and S will give yellow precipitate with I

_{2}

/NaOH. E. Q alone will deposit silver with Tollen's reagent Choose the correct option.

(A)A, C and E only
(B)A and E only
(C)C and E only
(D)A, B, D and E only

Q11·ChemistrySingle correctJEE Main 2026

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:-

\text{CH}_{3}-\text{CH}=\text{CH}-\text{O}-\text{CH}=\text{CH}_{2}

\downarrow \text{H}_{3}\text{O}^{(+)}

\text{CH}_{3}-\text{CH}_{2}-\text{CH}=\text{O}

and

\text{O}=\text{CH}-\text{CH}_{3}

Based on this, predict the solution / reagent that will help to distinguish “P” and “Q” obtained in the following reaction.

\text{CH}_{3}-\text{CH}=\text{CH}-\text{O}-\overset{\overset{\text{CH}_{3}}{|}}{\text{C}}=\text{CH}_{2} \xrightarrow[\Delta]{\text{H}_{3}\text{O}^{(+)}} \text{P} + \text{Q}

(A)Lucas reagent
(B)2,4-DNP reagent
(C)Saturated $\text{NaHSO}_{3}$ solution
(D)Fehling solution

Q12·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : Cross aldol condensation between two different aldehydes will always produce four different products. Statement II : When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are false
(B)Statement I is false but Statement II is true
(C)Both Statement I and Statement II are true
(D)Statement I is true but Statement II is false

Q13·ChemistrySingle correctJEE Main 2026

A student is given one compound among the following compounds that gives positive test with Tollen's reagent. The compound is :

(A)D
(B)A
(C)B
(D)C

Q14·ChemistrySingle correctJEE Main 2026

'x' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. 'y' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of 'x' and one mole of 'y' react with each other in the presence of alkali followed by heating ?

(A)2-Methylbut-2-enal
(B)Pent-2-enal
(C)2-Methylpent-2-enal
(D)3-Methylbut-2-enal

Q15·ChemistrySingle correctJEE Main 2026

Iodoform test can differentiate between A. Methanol and Ethanol B. CH

_{3}

COOH and CH

_{3}

CH

_{2}

COOH C. Cyclohexene and cyclohexanone D. Diethyl ether and Pentan-3-one E. Anisole and acetone Choose the correct answer from the options given below:

(A)A & E only
(B)A & D only
(C)A, B & E only
(D)B, C & E only

Q16·ChemistrySingle correctJEE Main 2026

Which of the following statements are TRUE about Haloform reaction? A. Sodium hypochlorite reacts with KI to give KOI. B. KOI is a reducing agent. C. α, β-unsaturated methylketone

\left(\mathrm{CH_{3}-CH=CH-}\overset{\text{O}}{\overset{\|}{\mathrm{C}}}\mathrm{-CH_{3}}\right)

will give iodoform reaction. D. Isopropyl alcohol will not give iodoform test. E. Methanoic acid will give positive iodoform test. Choose the correct answer from the options given below:

(A)A, C & E only
(B)A, B & C only
(C)A & C only
(D)B, D & E only

Q17·ChemistrySingle correctJEE Main 2026

The compound A,

C_{8}H_{8}O_{2}

reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as

(A)2-hydroxy acetophenone
(B)4-methyoxy benzaldehyde
(C)4-hydroxy benzylaldehyde
(D)4-methyl benzoic acid

Q18·ChemistrySingle correctJEE Main 2026

Match the LIST-I (Reagents) with LIST-II (Name of Reaction involving carbonyl compound) Choose the correct answer from the options given below

List-I (Reagents)	List-II (Name of Reaction involving carbonyl compound)
A.NH $_2$ – NH $_2$ , KOH	I.Tollen's Test
B.Ag(NH $_3$ ) $_2$ OH	II.Clemmensen Reduction
C.Aq. CuSO $_4$ , Sodium Potassium tartarate, KOH	III.Wolff-Kishner Reduction
D.Zn – Hg, HCl	IV.Fehling's Test

(A)A-III, B-I, C-IV, D-II
(B)A-II, B-I, C-IV, D-III
(C)A-IV, B-III, C-II, D-I
(D)A-III, B-IV, C-I, D-II

Q19·ChemistrySingle correctJEE Main 2026

Match List-I (Reagents) with List-II (Reaction Name (Involving aldehydes)). Choose the correct answer from the options given below:

Reagents	Reaction Name (Involving aldehydes)
A. $ext{H}_{2}$ , $ext{Pd-BaSO}_{4}$	I.Etard Reaction
B. $ext{SnCl}_{2}$ , HCl	II.Rosenmund Reduction
C. $ext{CrO}_{2} ext{Cl}_{2}$ , $ext{CS}_{2}$	III.Gatterman - Koch Reaction
D. $ext{CO,HCl}$ , Anhyd. $ext{AlCl}_{3}$	IV.Stephen Reaction

(A)A-II, B-III, C-IV, D-I
(B)A-IV, B-III, C-I, D-II
(C)A-IV, B-I, C-II, D-III
(D)A-II, B-IV, C-I, D-III

Q20·ChemistrySingle correctJEE Main 2026

An organic compound "P" of molecular formula

C_6H_{12}O_3

gives positive lodoform test but negative Tollen's test. When "P" is treated with dilute acid, it produces "Q". "Q" gives positive Tollen's test and also iodoform test. The structure of "P" is :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q21·ChemistrySingle correctJEE Advanced 2025

Monocyclic compounds P, Q, R and S are the major products formed in the reaction sequences given below. The product having the highest number of unsaturated carbon atom(s) is

(A)P
(B)Q
(C)R
(D)S

Q22·ChemistryNumericalJEE Advanced 2025

The reaction sequence given below is carried out with 16 moles of X. The yield of the major product in each step is given below the product in parentheses. The amount (in grams) of S produced is ______. Use: Atomic mass (in amu) : H = 1, C = 12, O = 16, Br = 80

Q23·ChemistrySingle correctJEE Main 2025

When the compound shown in the figure undergoes intramolecular aldol condensation, the major product formed is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q24·ChemistrySingle correctJEE Main 2025

"P" is an optically active compound with molecular formula

C_6H_{12}O

. When "P" is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of "P".

(A) $CH_3{-}CO{-}CH_2{-}CH_2{-}CH_2{-}CH_3$
(B) $CH_3{-}CO{-}CH(CH_2CH_3){-}CH_3$
(C) $H{-}CO{-}CH_2{-}CH(CH_2CH_3){-}CH_3$
(D) $CH_3{-}CO{-}CH_2{-}CH(CH_3){-}CH_3$

Q25·ChemistrySingle correctJEE Main 2025

Which among the following compounds give yellow solid when reacted with NaOI/NaOH?

(A)(B), (C) and (E) Only
(B)(A) and (C) Only
(C)(C) and (D) Only
(D)(A), (C) and (D) Only

Q26·ChemistrySingle correctJEE Main 2025

Aldol condensation is a popular and classical method to prepare

\alpha,\beta

-unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q27·ChemistrySingle correctJEE Main 2025

An organic compound (X) with molecular formula

C_3H_6O

is not readily oxidised. On reduction it gives

(C_3H_8O)

(Y) which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This Grignard reagent on reaction with (X) followed by hydrolysis give 2,3-dimethylbutan-2-ol. Compounds (X), (Y) and (Z) respectively are:

(A) $CH_3COCH_3$ , $CH_3CH_2CH_2OH$ , $CH_3CH(Br)CH_3$
(B) $CH_3COCH_3$ , $CH_3CH(OH)CH_3$ , $CH_3CH(Br)CH_3$
(C) $CH_3CH_2CHO$ , $CH_3CH_2CH_2OH$ , $CH_3CH_2CH_2Br$
(D) $CH_3CH_2CHO$ , $CH_3CH=CH_2$ , $CH_3CH(Br)CH_3$

Q28·ChemistrySingle correctJEE Main 2025

The major product (P) in the following reaction is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q29·ChemistrySingle correctJEE Main 2025

The number of molecules from below which cannot give iodoform reaction is: Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol.

(A)5
(B)4
(C)3
(D)2

Q30·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): Vanillin will react with NaOH and also with Tollen’s reagent. Statement (II): Vanillin will undergo self aldol condensation very easily. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is incorrect but Statement II is correct
(B)Statement I is correct but Statement II is incorrect
(C)Both Statement I and Statement II are incorrect
(D)Both Statement I and Statement II are correct

Q31·ChemistrySingle correctJEE Main 2025

The product (P) formed in the following reaction (shown in the figure) is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q32·ChemistryIntegerJEE Main 2025

In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction is ______ %.

Q33·ChemistryIntegerJEE Main 2025

In the following reaction sequence (shown in the figure), the final product is compound 'S'. 0.1 mole of compound 'S' will weigh ______ g. (Given molar mass in g mol

^{-1}

: C:12, H:1, O:16)

Q34·ChemistrySingle correctJEE Main 2025

Both acetaldehyde and acetone (individually) undergo which of the following reactions? A. Iodoform Reaction B. Cannizaro Reaction C. Aldol condensation D. Tollen's Test E. Clemmensen Reduction. Choose the correct answer from the options given below:

(A)A, B and D only
(B)A, C and E only
(C)C and E only
(D)B, C and D only

Q35·ChemistrySingle correctJEE Main 2025

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

(A)benzaldehyde < acetophenone < p-nitrobenzaldehyde < p-tolualdehyde
(B)acetophenone < benzaldehyde < p-tolualdehyde < p-nitrobenzaldehyde
(C)acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde
(D)p-nitrobenzaldehyde < benzaldehyde < p-tolualdehyde < acetophenone

Q36·ChemistrySingle correctJEE Main 2025

The product (A) formed in the following reaction sequence is :

CH_3{-}C\equiv CH\xrightarrow{\text{(i) Hg}^{2+}/\text{H}_2\text{SO}_4,\ \text{(ii) HCN},\ \text{(iii) H}_2/\text{Ni}}

(A)

(A) $(CH_3)_2C(NH_2){-}CH_2OH$
(B) $(CH_3)_2C(OH){-}CH_2NH_2$
(C) $CH_3CH_2CH(NH_2){-}CH_2OH$
(D) $CH_3CH_2CH(OH){-}CH_2NH_2$

Q37·ChemistrySingle correctJEE Main 2025

Match List-I (Aldehyde Synthesis) with List-II (Name Reaction). Choose the correct answer from the options given below:

List-I (Aldehyde Synthesis)	List-II (Name Reaction)
A. $RCN\xrightarrow{\text{(i) }SnCl_2,3HCl\ \text{(ii) }H_2O}RCHO$	I.Etard reaction
B. $C_6H_5COCl\xrightarrow{H_2,\ Pd\text{-}BaSO_4}C_6H_5CHO$	II.Gattermann-Koch reaction
C. $C_6H_5CH_3\xrightarrow{\text{(i) }CrO_2Cl_2,CS_2\ \text{(ii) }H_2O}C_6H_5CHO$	III.Rosenmund reduction
D. $C_6H_6\xrightarrow{\text{(i) }CO,HCl\ \text{(ii) anhydrous }AlCl_3/CuCl}C_6H_5CHO$	IV.Stephen reaction

(A)(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
(B)(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
(C)(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
(D)(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

Q38·ChemistrySingle correctJEE Main 2025

Given below are two statements. Consider the following reaction:

R\text{-CHO}+H_2O\xrightleftharpoons{K}R\text{-CH(OH)}_2

. Statement (I): In the case of formaldehyde (HCHO), K is about 2280, due to small substituents, hydration is faster. Statement (II): In the case of trichloro acetaldehyde (CCl

_3

CHO), K is about 2000 due to

-I

effect of

-

Cl. In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I true but Statement II is false
(B)Both Statement I and Statement II are true
(C)Statement I is false but Statement II is true
(D)Both Statement I and Statement II are false

Q39·ChemistrySingle correctJEE Main 2025

The major product of the following reaction is :

CH_3CH_2CHO\xrightarrow[\text{reflux}]{\text{excess HCHO, alkali}}

?

(A) $CH_3-CH_2-CH_2-OH$
(B) $CH_3-CH(CH_2OH)-CHO$
(C) $CH_3-C(CH_2OH)_2-CH_2OH$
(D) $CH_3-C(=CH_2)-CHO$

Q40·ChemistrySingle correctJEE Main 2025

Among the compounds (A)–(E) shown, choose the set that gives a positive Fehling’s test.

(A)(A), (C) and (D) only
(B)(A), (D) and (E) only
(C)(C), (D) and (E) only
(D)(A), (B) and (C) only

Q41·ChemistrySingle correctJEE Main 2025

Toluene (excess)

\xrightarrow{\text{(i) }CrO_2Cl_2,\,CS_2\text{ (ii) }H_3O^+\text{ (iii) }NaHSO_3}

Filter

\longrightarrow

Residue (A). Residue (A) + HCl (dil.)

\longrightarrow

Compound (B). Structure of residue (A) and compound (B) formed respectively is:

(A)Structures (1)
(B)Structures (2)
(C)Structures (3)
(D)Structures (4)

Q42·ChemistryNumericalJEE Advanced 2024

An organic compound P having molecular formula

C_6H_6O_3

gives ferric chloride test and does not have intramolecular hydrogen bond. The compound P reacts with 3 equivalents of

NH_2OH

to produce oxime Q. Treatment of P with excess methyl iodide in the presence of KOH produces compound R as the major product. Reaction of R with excess *iso*-butylmagnesium bromide followed by treatment with

H_3O^{+}

gives compound S as the major product. The total number of methyl (

-CH_3

) group(s) in compound S is _____.

Q43·ChemistryMultiple correctJEE Advanced 2024

The option(s) with correct sequence of reagents for the conversion of P to Q is(are)

(A)i) Lindlar's catalyst, $H_2$ ; ii) $SnCl_2$ /HCl; iii) $NaBH_4$ ; iv) $H_3O^+$
(B)i) Lindlar's catalyst, $H_2$ ; ii) $H_3O^+$ ; iii) $SnCl_2$ /HCl; iv) $NaBH_4$
(C)i) $NaBH_4$ ; ii) $SnCl_2$ /HCl; iii) $H_3O^+$ ; iv) Lindlar's catalyst, $H_2$ ;
(D)i) Lindlar's catalyst, $H_2$ ; ii) $NaBH_4$ ; iii) $SnCl_2$ /HCl; iv) $H_3O^+$

Q44·ChemistrySingle correctJEE Advanced 2024

List-I contains various reaction sequence and List-II contains the possible products. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

List-I	List-II
P.see figure	1.see figure
Q.see figure	2.see figure
R.see figure	3.see figure
S.see figure	4.see figure
	5.see figure

(A)(P) $\to$ (3), (Q) $\to$ (5), (R) $\to$ (4), (S) $\to$ (1)
(B)(P) $\to$ (3), (Q) $\to$ (2), (R) $\to$ (4), (S) $\to$ (1)
(C)(P) $\to$ (3), (Q) $\to$ (5), (R) $\to$ (1), (S) $\to$ (4)
(D)(P) $\to$ (5), (Q) $\to$ (2), (R) $\to$ (4), (S) $\to$ (1)

Q45·ChemistryMultiple correctJEE Advanced 2024

Reaction of

\textit{iso}

-propylbenzene with O

_{2}

followed by the treatment with H

_{3}

O

^{+}

forms phenol and a by product

\mathbf{P}

. Reaction of

\mathbf{P}

with 3 equivalents of Cl

_{2}

gives compound

\mathbf{Q}

. Treatement of

\mathbf{Q}

with Ca(OH)

_{2}

produces compound

\mathbf{R}

and calcium salt

\mathbf{S}

. The correct statement(s) regarding

\mathbf{P, Q, R}

and

\mathbf{S}

is(are)

(A)Reaction of $\mathbf{P}$ with $\mathbf{R}$ in the presence of KOH followed by acidification gives
(B)Reaction of $\mathbf{R}$ with O $_{2}$ in the presence of light gives phosgene gas
(C) $\mathbf{Q}$ reacts with aqueous NaOH to produce Cl $_{3}$ CCH $_{2}$ OH and Cl $_{3}$ CCOONa
(D) $\mathbf{S}$ on heating gives $\mathbf{P}$

Q46·ChemistryIntegerJEE Advanced 2024

Complete reaction of acetaldehyde with excess formaldehyde, upon heating with conc. NaOH solution, gives

\mathbf{P}

and

\mathbf{Q}

. Compound

\mathbf{P}

does not give Tollen's test, whereas

\mathbf{Q}

on acidification gives positive Tollen's test. Treatment of

\mathbf{P}

with excess cyclohexanone in the presence of catalytic amount of p-tolunesulfonic acid (PTSA) gives product

\mathbf{R}

. Sum of the number of methylene groups (

-

CH

_{2}-

) and oxygen atoms in

\mathbf{R}

is __________.

Q47·ChemistrySingle correctJEE Main 2024

The major product of the reaction shown in the figure is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q48·ChemistrySingle correctJEE Main 2024

Which of the following compounds will give silver mirror with ammoniacal silver nitrate? (A) Formic acid (B) Formaldehyde (C) Benzaldehyde (D) Acetone. Choose the correct answer from the options given below:

(A)C and D only
(B)A, B and C only
(C)A only
(D)B and C only

Q49·ChemistrySingle correctJEE Main 2024

Which of the following compounds (shown in the figure) can give a positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q50·ChemistryNumericalJEE Main 2024

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives x as the major product. The number of

\pi

bonds in the product x is _______ .

Q51·ChemistrySingle correctJEE Main 2024

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

(A) $H-CHO$
(B) $C_2H_5-CHO$
(C) $CH_3-CHO$
(D) $C_3H_7-CHO$

Q52·ChemistryNumericalJEE Main 2024

In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is __________ g. (Nearest integer)

Q53·ChemistrySingle correctJEE Main 2024

Identify 'A' in the following reaction (shown in the figure).

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q54·ChemistryNumericalJEE Main 2024

The number of correct reaction(s) among the following is ___

Q55·ChemistrySingle correctJEE Main 2024

Identify the product in the following reaction (Clemmensen reduction, Zn-Hg/HCl):

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q56·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: Acidity of

\alpha

-hydrogens of aldehydes and ketones is responsible for Aldol reaction. Statement II: Reaction between benzaldehyde and ethanal will NOT give Cross-Aldol product. In the light of above statements, choose the most appropriate answer from the options given below.

(A)Both Statement I and Statement II are correct.
(B)Both Statement I and Statement II are incorrect.
(C)Statement I is incorrect but Statement II is correct.
(D)Statement I is correct but Statement II is incorrect.

Q57·ChemistryNumericalJEE Main 2024

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and

\pi

electrons is ______.

Q58·ChemistrySingle correctJEE Main 2024

Identify A and B in the following sequence of reaction:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q59·ChemistrySingle correctJEE Main 2024

Match List-I (reactions) with List-II (reagents). Choose the correct answer from options given below:

List-I (Reactions)	List-II (Reagents)
A. $CH_3(CH_2)_2COOC_2H_5\to CH_3(CH_2)_2CHO$	I. $CH_3MgBr,\ H_2O$
B. $C_6H_5COC_6H_5\to C_6H_5CH_2C_6H_5$	II.Zn(Hg) and conc. HCl
C. $C_6H_5CHO\to C_6H_5CH(OH)CH_3$	III. $NaBH_4,\ H^+$
D. $CH_3COCH_2COOC_2H_5\to CH_3CH(OH)CH_2COOC_2H_5$	IV.DIBAL-H, $H_2O$

(A)A-III, B-IV, C-I, D-II
(B)A-IV, B-II, C-I, D-III
(C)A-IV, B-II, C-III, D-I
(D)A-III, B-IV, C-II, D-I

Q60·ChemistryNumericalJEE Main 2024

The product of the following reaction is P. The compound shown (a benzene ring bearing a –CHO group and a –OH group at the para position) is treated with (i) PhMgBr (1 equiv.), (ii) aq.

NH_4Cl

. The number of hydroxyl groups present in the product P is ______.

Q61·ChemistrySingle correctJEE Main 2024

Identify major product 'P' formed in the following reaction (shown in the figure).

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q62·ChemistrySingle correctJEE Main 2024

Identify the name of the following reaction (shown in the figure).

(A)Stephen reaction
(B)Etard reaction
(C)Gatterman-Koch reaction
(D)Rosenmund reaction

Q63·ChemistryNumericalJEE Main 2024

The compound formed by the reaction of ethanal with semicarbazide contains ___ number of nitrogen atoms.

Q64·ChemistrySingle correctJEE Main 2024

This reduction reaction is known as:

(A)Rosenmund reduction
(B)Wolff-Kishner reduction
(C)Stephen reduction
(D)Etard reduction

Q65·ChemistrySingle correctJEE Main 2024

Product A and B formed in the following set of reactions are:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q66·ChemistrySingle correctJEE Main 2024

In the given reactions identify the reagent A and reagent B.

(A)A- $CrO_3$ , B- $CrO_3$
(B)A- $CrO_3$ , B- $CrO_2Cl_2$
(C)A- $CrO_2Cl_2$ , B- $CrO_2Cl_2$
(D)A- $CrO_2Cl_2$ , B- $CrO_3$

Q67·ChemistrySingle correctJEE Main 2024

m-Chlorobenzaldehyde on treatment with 50% KOH solution yields:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q68·ChemistrySingle correctJEE Main 2024

Match List I with List II. Choose the correct answer from the options given below:

List I (Compound)	List II (pKa value)
A.Ethanol	I.10.0
B.Phenol	II.15.9
C.m-Nitrophenol	III.7.1
D.p-Nitrophenol	IV.8.3

(A)A-I, B-II, C-III, D-IV
(B)A-IV, B-I, C-II, D-III
(C)A-III, B-IV, C-I, D-II
(D)A-II, B-I, C-IV, D-III

Q69·ChemistryNumericalJEE Main 2024

From the compounds given below, number of compounds which give positive Fehling’s test is ______ . Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

Q70·ChemistrySingle correctJEE Main 2024

Identify the reagents used for the following conversion:

(A)A = LiAlH4, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
(B)A = LiAlH4, B = NaOH(alc), C = Zn/HCl
(C)A = DIBAL-H, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
(D)A = DIBAL-H, B = NaOH(alc), C = Zn/HCl

Q71·ChemistrySingle correctJEE Advanced 2023

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match List-I with List-II and choose the correct option.

List-I	List-II
P.Etard reaction	1.Acetophenone $\xrightarrow{\text{Zn-Hg, HCl}}$
Q.Gattermann reaction	2.Toluene $\xrightarrow[\text{(ii) SOCl}_2]{\text{(i) KMnO}_4\text{, KOH, }\Delta}$
R.Gattermann-Koch reaction	3.Benzene $\xrightarrow[\text{anhyd. AlCl}_3]{\text{CH}_3\text{Cl}}$
S.Rosenmund reduction	4.Aniline $\xrightarrow[\text{273-278 K}]{\text{NaNO}_2/\text{HCl}}$
	5.Phenol $\xrightarrow{\text{Zn, }\Delta}$

(A)P $\rightarrow$ 2; Q $\rightarrow$ 4; R $\rightarrow$ 1; S $\rightarrow$ 3
(B)P $\rightarrow$ 1; Q $\rightarrow$ 3; R $\rightarrow$ 5; S $\rightarrow$ 2
(C)P $\rightarrow$ 3; Q $\rightarrow$ 2; R $\rightarrow$ 1; S $\rightarrow$ 4
(D)P $\rightarrow$ 3; Q $\rightarrow$ 4; R $\rightarrow$ 5; S $\rightarrow$ 2

Q72·ChemistryMultiple correctJEE Advanced 2023

In the following reactions, P, Q, R, and S are the major products. The correct statement(s) about P, Q, R, and S is (are)

(A)Both P and Q have asymmetric carbon(s).
(B)Both Q and R have asymmetric carbon(s).
(C)Both P and R have asymmetric carbon(s).
(D)P has asymmetric carbon(s), S does not have any asymmetric carbon.

Q73·ChemistrySingle correctJEE Main 2023

For the drawn 1,2,3-indantrione (ninhydrin-type triketone of indane) reacting with

H_2O

to give major product 'A', the major product 'A' formed in the above reaction is

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q74·ChemistrySingle correctJEE Main 2023

'A'

\xrightarrow{OH^-,\ \Delta}

major product. 'A' (shown) and its major product are:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q75·ChemistryNumericalJEE Main 2023

The mass of NH

_3

produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is _________ kg. (Nearest integer) Molar Mass of C = 12 g/mol, N = 14 g/mol, O = 16 g/mol.

Q76·ChemistrySingle correctJEE Main 2023

'A' and 'B' in the below reactions are: (a 2-alkyl cyclohexanone)

\xrightarrow{KMNO_4}

'A' (Major Product), then

\xrightarrow{(i)\ NH_2.NH_2,\ KOH\ (ii)\ H_3O^+}

'B' (Major Product). (R = alkyl)

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q77·ChemistrySingle correctJEE Main 2023

The major product formed in the following reaction is:

C_6H_5\text{--}CH(OH)\text{--}CH(CH_3)\text{--}CH_2\text{--}CHO \xrightarrow[\Delta]{Zn(Hg)/HCl}

Major Product. The possible products (A), (B), (C) and (D) are shown in the figure. Choose the correct answer from the options given below:

(A)A only
(B)B only
(C)C only
(D)D only

Q78·ChemistryNumericalJEE Main 2023

For the reaction in which an aldehyde-alcohol substrate (y mole) reacts with x mol of MeMgBr followed by

H_3O^+

to give the corresponding diol, the ratio x/y on completion of the above reaction is __________.

Q79·ChemistrySingle correctJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Methyl cyclohexyl ketone can be subjected to Wolff-Kishner reduction to give ethylcyclohexane. Reason R: Wolff-Kishner reduction is used to convert an acyl chloride (

R\text{--}COCl

) into a methyl group (

R\text{--}CH_3

). In the light of the above statements, choose the correct answer from the options given below:

(A)Both A and R are true but R is NOT the correct explanation of A
(B)A is true but R is false
(C)A is false but R is true
(D)Both A and R are true and R is the correct explanation of A

Q80·ChemistrySingle correctJEE Main 2023

The reaction used for the preparation of soap from fat is:

(A)a reduction reaction
(B)an alkaline hydrolysis reaction
(C)an addition reaction
(D)an oxidation reaction

Q81·ChemistrySingle correctJEE Main 2023

Find out the major product from the following reaction

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q82·ChemistryNumericalJEE Main 2023

Among the following, the number of compounds which will give positive iodoform reaction is ____. (a) 1-Phenylbutan-2-one (b) 2-Methylbutan-2-ol (c) 3-Methylbutan-2-ol (d) 1-Phenylethanol (e) 3,3-dimethylbutan-2-ol (f) 1-Phenylpropan-2-ol

Q83·ChemistrySingle correctJEE Main 2023

Match List I with List II. Choose the correct answer from the options given below:

List I (Name of reaction)	List II (Reagent used)
A.Hell-Volhard-Zelinsky reaction	I. $NaOH+I_2$
B.Iodoform reaction	II.(i) $CrO_2Cl_2,\,CS_2$ (ii) $H_2O$
C.Etard reaction	III.(i) $Br_2$ /red phosphorous (ii) $H_2O$
D.Gatterman-Koch reaction	IV. $CO,\,HCl,$ anhyd. $AlCl_3$

(A)A-III, B-II, C-I, D-IV
(B)A-IV, B-II, C-I, D-III
(C)A-I, B-II, C-IV, D-III
(D)A-III, B-I, C-II, D-IV

Q84·ChemistrySingle correctJEE Main 2023

The structures of major products A, B and C in the following reaction sequence are:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q85·ChemistryNumericalJEE Main 2023

The number of isomeric compounds with molecular formula

\text{C}_9\text{H}_{10}\text{O}

which (i) do not dissolve in NaOH (ii) do not dissolve in HCl (iii) do not give orange precipitate with 2,4-DNP (iv) on hydrogenation give identical compound with molecular formula

\text{C}_9\text{H}_{12}\text{O}

is _______ .

Q86·ChemistryNumericalJEE Main 2023

The number of molecules which gives haloform test among the following molecules is _________

Q87·ChemistrySingle correctJEE Main 2023

Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R). The final product (R) is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q88·ChemistrySingle correctJEE Main 2023

Consider the following reaction Propanal + Methanal

\xrightarrow{(i) dil.NaOH, (ii) \Delta, (iii) NaCN, (iv) H_3O^+}

Product B (

C_5H_8O_3

) The correct statement for product B is. It is

(A)optically active alcohol and is neutral
(B)racemic mixture and gives a gas with saturated $NaHCO_3$ solution
(C)optically active and adds one mole of bromine
(D)racemic mixture and is neutral

Q89·ChemistrySingle correctJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: 2'-hydroxyacetophenone (a 2-hydroxy aryl methyl ketone) can be easily reduced using Zn-Hg/HCl to 2-ethylphenol. Reason R: Zn-Hg/HCl is used to reduce a carbonyl group to a

-CH_2-

group. In the light of the above statements, choose the correct answer from the options given below:

(A)A is true but R is false
(B)Both A and R are true and R is the correct explanation of A
(C)A is false but R is true
(D)Both A and R are true but R is not the correct explanation of A

Q90·ChemistrySingle correctJEE Main 2023

Find out the major products from the following reaction sequence.

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q91·ChemistrySingle correctJEE Main 2023

Match List I (Reaction) with List II (Reagents). Choose the correct answer from the options given below:

List I (Reaction)	List II (Reagents)
A.Hoffmann Degradation	I.Conc. KOH, $\Delta$
B.Clemmensen reduction	II.CHCl $_3$ , NaOH/H $_3$ O $^+$
C.Cannizzaro reaction	III.Br $_2$ , NaOH
D.Reimer-Tiemann Reaction	IV.Zn-Hg/HCl

(A)(A)-III, (B)-IV, (C)-I, (D)-II
(B)(A)-II, (B)-I, (C)-III, (D)-IV
(C)(A)-III, (B)-IV, (C)-II, (D)-I
(D)(A)-II, (B)-IV, (C)-I, (D)-III

Q92·ChemistrySingle correctJEE Main 2023

The major product ‘P’ for the following sequence of reactions is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q93·ChemistrySingle correctJEE Main 2023

Identify the major product 'A' in the reaction shown in the figure.

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q94·ChemistrySingle correctJEE Main 2023

In a sequence

P \rightarrow Q \rightarrow R

(where P is n-hexane), R on treatment with conc. NaOH undergoes the Cannizzaro reaction to give PhCOOH and PhCH

_2

OH. The correct sequence of reagents for the preparation of Q and R is:

(A)(i) $CrO_2Cl_2, H_3O^+$ ; (ii) $Cr_2O_3, 770K, 20$ atm
(B)(i) $KMnO_4, OH^-$ ; (ii) $Mo_2O_3, \Delta$
(C)(i) $Cr_2O_3, 770K, 20$ atm; (ii) $CrO_2Cl_2, H_3O^+$
(D)(i) $Mo_2O_3, \Delta$ ; (ii) $CrO_2Cl_2, H_3O^+$

Q95·ChemistrySingle correctJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Acetal/Ketal is stable in basic medium. Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium. In the light of the above statements, choose the correct answer from the options given below:

(A)A is true but R is false
(B)A is false but R is true
(C)Both A and R are true but R is NOT the correct explanation of A
(D)Both A and R are true and R is the correct explanation of A

Q96·ChemistrySingle correctJEE Main 2023

Compound (X) undergoes the following sequence of reactions to give the Lactone (Y). Compound (X) is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q97·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: The given compound under Clemmensen reduction conditions will give the indicated product. Statement II: The given compound under Wolff-Kishner reduction condition will give the indicated product. In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I is false but Statement II is true
(B)Statement I is true but Statement II is false
(C)Both Statement I and Statement II are true
(D)Both Statement I and Statement II are false

Q98·ChemistrySingle correctJEE Main 2023

'R' formed in the following sequence of reactions is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q99·ChemistryNumericalJEE Main 2022

The number of stereoisomers formed in a reaction of (

\pm

) Ph(C=O) C(OH)(CN)Ph with HCN is_____.

Q100·ChemistrySingle correctJEE Main 2022

Consider the above reaction sequence, the Product 'C' is :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q101·ChemistrySingle correctJEE Main 2022

Consider the following reaction sequence : The product 'B' is :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q102·ChemistrySingle correctJEE Main 2022

The structure of A in the given reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q103·ChemistrySingle correctJEE Main 2022

Match List-I with List-II. List-I Lits-II (I) Gatterman Koch reaction (II) Etard reaction (III) Stephen reaction (IV) Rosenmund reaction Choose the correct answer from the options given below:

(A)(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
(B)(A)-(I), (B)-(II), (C)-(III), (D)-(IV)
(C)(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
(D)(A)-(III), (B)-(II), (C)-(I), (D)-(IV)

Q104·ChemistryNumericalJEE Main 2022

In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is______×10

^{-2}

g. (Nearest integer)

Q105·ChemistrySingle correctJEE Main 2022

The products formed in the following reaction, A and B are

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q106·ChemistrySingle correctJEE Main 2022

Consider the above reaction and predict the major product.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q107·ChemistrySingle correctJEE Main 2022

Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide (PhMgBr) followed by acidic hydrolysis ?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q108·ChemistrySingle correctJEE Main 2022

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions ?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q109·ChemistrySingle correctJEE Main 2022

Isobutyraldehyde on reaction with formaldehyde and K

_2

CO

_3

gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q110·ChemistrySingle correctJEE Main 2022

The correct structure of product ‘A’ formed in the following reaction.

\text{PhCHO} + \text{Ph}\cdot\text{CHO} \xrightarrow[\text{in D}_2\text{O}]{\text{NaOD}} \text{A} + \text{Ph} - \overset{\substack{\text{O}\\\|}}{\text{C}} - \text{O}^-

\left(\text{Ph is} - \text{C}_6\text{H}_5\right)

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q111·ChemistrySingle correctJEE Main 2022

Which of the following reactions will yield benzaldehyde as a product?

(A)(B) and (C)
(B)(C) and (D)
(C)(A) and (D)
(D)(A) and (C)

Q112·ChemistrySingle correctJEE Main 2022

Among the following structures, which will show the most stable enamine formation ? (Where Me is

-CH_{3}

)

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q113·ChemistrySingle correctJEE Main 2022

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

(A) $LiAlH_4$
(B) $KMnO_4$
(C)MnO
(D) $NaBH_4$

Q114·ChemistrySingle correctJEE Main 2022

Oxidation of toluene to Benzaldehyde can be easily carried out with which of the following reagents?

(A) $CrO_3$ /acetic acid, $H_3O^+$
(B) $CrO_3$ /acetic anhydride, $H_3O^+$
(C) $KMnO_4$ /HCl, $H_3O^+$
(D)CO/HCl, anhydrous $AlCl_3$

Q115·ChemistrySingle correctJEE Main 2022

The final product 'A' in the following reaction sequence

CH_3CH_2-CO-CH_3

→(HCN) ? →(95%

H_2SO_4

, Heat) A

(A) $CH_3-CH=C(CH_3)-COOH$
(B) $CH_3-CH=C(CH_3)-CN$
(C) $CH_3-CH-C(OH)(CH_3)-COOH$
(D) $CH_3-CH=C(CH_3)-CONH_2$

Q116·ChemistrySingle correctJEE Main 2022

Which will have the highest enol content ?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q117·ChemistrySingle correctJEE Main 2022

Consider the above reaction sequence and identify the product B.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q118·ChemistrySingle correctJEE Main 2022

Which of the following conditions or reaction sequence will NOT give acetophenone as the major product ?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q119·ChemistrySingle correctJEE Main 2022

Which of the following ketone will NOT give enamine on treatment with secondary amines? [where t-Bu is

-

C(CH

_3

)

_3

]

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q120·ChemistrySingle correctJEE Main 2022

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is

(A)2- pentene
(B)proponaldehyde
(C)2-butene
(D)4-methylpent-2-ene

Q121·ChemistrySingle correctJEE Main 2022

Which of the following reagents/ reactions will convert 'A' to 'B'?

(A)PCC oxidation
(B)Ozonolysis
(C)BH $_3$ ,H $_2$ O $_2$ / $^-$ OH followed by PCC oxidation
(D)HBr, hydrolysis followed by oxidation by K $_2$ Cr $_2$ O $_7$ .

Q122·ChemistrySingle correctJEE Main 2022

Which of the following is an example of conjugated diketone?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q123·ChemistryIntegerJEE Advanced 2021

In the reaction given below, the total number of atoms having

sp^2

hybridization in the major product

\mathbf{P}

is ___

Q124·ChemistryNumericalJEE Advanced 2021

For the following reaction scheme, percentage yields are given along the arrow :

\mathbf{x}

g and

\mathbf{y}

g are mass of

\mathbf{R}

and

\mathbf{U}

, respectively. (Use : Molar mass (in g mol

^{-1}

) of H, C and O as 1, 12 and 16, respectively) The value of

\mathbf{y}

is______.

Q125·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. Statement II : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Both Statement I and Statement II are true.
(B)Statement I is true but Statement II is false.
(C)Statement I is false but Statement II is true.
(D)Both Statement I and Statement II are false.

Q126·ChemistrySingle correctJEE Main 2021

For the reaction given below : The compound which is not formed as a product in the reaction is a :

(A)compound with both alcohol and acid functional groups
(B)monocarboxylic acid
(C)dicarboxylic acid
(D)diol

Q127·ChemistrySingle correctJEE Main 2021

The structures of A and B formed in the following reaction are : [Ph =

-\mathrm{C_6H_5}

]

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q128·ChemistrySingle correctJEE Main 2021

The structure of product C, formed by the following sequence of reactions is :

\mathrm{CH_3COOH} + \mathrm{SOCl_2} \longrightarrow \mathrm{A} \xrightarrow[\mathrm{AlCl_3}]{\text{Benzene}} \mathrm{B} \xrightarrow[-\mathrm{OH}]{\mathrm{KCN}} \mathrm{C}

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q129·ChemistrySingle correctJEE Main 2021

Which one of the following is the major product of the given reaction?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q130·ChemistrySingle correctJEE Main 2021

The structure of the starting compound

\mathbf{P}

used in the reaction given below is :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q131·ChemistrySingle correctJEE Main 2021

Match List-I with List-II : Choose the most appropriate match :

List-I (Chemical Reaction)	List-II (Reagent used)
a. $\mathrm{CH_3COOCH_2CH_3} \rightarrow \mathrm{CH_3CH_2OH}$	i. $\mathrm{CH_3MgBr}$ / $\mathrm{H_3O^+}$ (1.equivalent)
b. $\mathrm{CH_3COOCH_3} \rightarrow \mathrm{CH_3CHO}$	ii. $\mathrm{H_2SO_4}$ / $\mathrm{H_2O}$
c. $\mathrm{CH_3C \equiv N} \rightarrow \mathrm{CH_3CHO}$	iii.DIBAL-H/ $\mathrm{H_2O}$
d. $\mathrm{CH_3C \equiv N} \rightarrow$	iv. $\mathrm{SnCl_2}$ , $\mathrm{HCl/H_2O}$

(A)a-ii, b-iv, c-iii, d-i
(B)a-iv, b-ii, c-iii, d-i
(C)a-ii, b-iii, c-iv, d-i
(D)a-iii, b-ii, c-i, d-iv

Q132·ChemistrySingle correctJEE Main 2021

Consider the given reaction, Identify 'X' and 'Y' :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q133·ChemistrySingle correctJEE Main 2021

The major products formed in the following reaction sequence

\mathbf{A}

and

\mathbf{B}

are :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q134·ChemistrySingle correctJEE Main 2021

Which one of the following compounds will give orange precipitate when treated with 2,4-Dinitrophenyl hydrazine?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q135·ChemistrySingle correctJEE Main 2021

R−CN

\xrightarrow{(i)\,DIBAL-H\ \ (ii)\,H_2O}

R−Y Consider the above reaction and identify "Y"

(A)−COOH
(B)− CH $_2$ NH $_2$
(C)−CHO
(D)− CONH $_3$

Q136·ChemistrySingle correctJEE Main 2021

[where Et ⇒

C_2H_5

, t − Bu ⇒

(CH_3)_3C

−] Consider the above reaction sequence, product "A" and product "B" formed respectively are:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q137·ChemistrySingle correctJEE Main 2021

A reaction of benzonitrile with one equivalent

CH_3MgBr

followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive______.

(A)Iodoform test
(B)Schiff's test
(C)Ninhydrin's test
(D)Tollen's test

Q138·ChemistrySingle correctJEE Main 2021

Consider the given reaction, the product 'X' is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q139·ChemistrySingle correctJEE Main 2021

Consider the above reaction, the major product 'P' is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q140·ChemistrySingle correctJEE Main 2021

Which one of the following compounds will provide a tertiary alcohol on reaction with excess of

CH_3MgBr

followed by hydrolysis?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q141·ChemistrySingle correctJEE Main 2021

Which among the above compound/s does / do not form silver mirror when treated with Tollen’s reagent?

(A)Only (IV)
(B)(III) and (IV) only
(C)Only (II)
(D)(I), (III) and (IV) only

Q142·ChemistrySingle correctJEE Main 2021

The major product (P) in the following reaction is :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q143·ChemistryNumericalJEE Main 2021

The number of nitrogen atoms in a semicarbazone molecule of acetone is___________.

Q144·ChemistryNumericalJEE Main 2021

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH

_{3}

)

_{2}

]

^{+}

per aldehyde group to form silver mirror is ________ .(Round off to the Nearest integer)

Q145·ChemistrySingle correctJEE Main 2021

Consider the above reaction, the product 'X' and 'Y' respectively are :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q146·ChemistrySingle correctJEE Main 2021

The product "A" in the above reaction is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q147·ChemistrySingle correctJEE Main 2021

Mesityl oxide is a common name of :

(A)2,4-Dimethyl pentan-3-one
(B)3-Methyl cyclohexane carbaldehyde
(C)2-Methyl cyclohexanone
(D)4-Methyl pent-3-en-2-one

Q148·ChemistrySingle correctJEE Main 2021

The structure of X is :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q149·ChemistrySingle correctJEE Main 2021

A (C

_4

H

_8

Cl

_2

)

\xrightarrow[\text{373 K}]{\text{Hydrolysis}}

B (C

_4

H

_8

O) B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B.

(A)1, 1-Dichlorobutane and 2-Butanone
(B)2, 2- Dichlorobutane and Butan-2-one
(C)2, 2- Dichlorobutane and Butanal
(D)1, 1- Dichlorobutane and Butanal

Q150·ChemistrySingle correctJEE Main 2021

Identify A in the given chemical reaction.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q151·ChemistrySingle correctJEE Main 2021

2,4-DNP test can be used to identify:

(A)aldehyde
(B)halogens
(C)ether
(D)amine

Q152·ChemistrySingle correctJEE Main 2021

The major product of the following reaction is : H2/CO CH3CH2CH=CH2 Rh catalyst

(A)CH3CH2CH2CHO
(B)CH3CH2CH=CH–CHO
(C)CH3CH2CH2CH2CHO
(D)CH3CH2C=CH2 CHO

Q153·ChemistrySingle correctJEE Main 2021

Which one of the following reactions will not form acetaldehyde?

(A)CH $_{3}$ CH $_{2}$ OH $\xrightarrow{\text{CrO}_{3} - \text{H}_{2}\text{SO}_{4}}$
(B)CH $_{3}$ CN $\xrightarrow[\text{ii) H}_{2}\text{O}]{\text{i) DIBAL-H}}$
(C)CH $_{2}$ = CH $_{2}$ + O $_{2}$ $\xrightarrow[\text{H}_{2}\text{O}]{\text{Pd(II)/Cu(II)}}$
(D)CH $_{3}$ CH $_{2}$ OH $\xrightarrow[\text{573 K}]{\text{Cu}}$

Q154·ChemistrySingle correctJEE Main 2021

The major product of the following chemical reaction is: CH

_{3}

CH

_{2}

CN

\xrightarrow[\text{3) Pd/BaSO}_{4}\text{, H}_{2}]{\substack{\text{1) H}_{3}\text{O}^{+}\text{, }\Delta \\ \text{2) SOCl}_{2}}}

?

(A)(CH $_{3}$ CH $_{2}$ CO) $_{2}$ O
(B)CH $_{3}$ CH $_{2}$ CHO
(C)CH $_{3}$ CH $_{2}$ CH $_{3}$
(D)CH $_{3}$ CH $_{2}$ CH $_{2}$ OH

Q155·ChemistrySingle correctJEE Main 2021

Match List-I and List-II. List – I (a)

R-\overset{\overset{O}{\|}}{C}-Cl \rightarrow R-CHO

(b)

R-CH_{2}-COOH \rightarrow R-\underset{\underset{Cl}{|}}{CH}-COOH

(c)

R-\overset{\overset{O}{\|}}{C}-NH_{2} \rightarrow R-NH_{2}

(d)

R-\overset{\overset{O}{\|}}{C}-CH_{3} \rightarrow R-CH_{2}-CH_{3}

List-II (i)

Br_{2}

/NaOH (ii)

H_{2}

/Pd-

BaSO_{4}

(iii) Zn(Hg)/Conc. HCl (iv)

Cl_{2}

/Red P,

H_{2}O

Choose the correct answer from the options given below :

(A)(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
(B)(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
(C)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
(D)(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

Q156·ChemistrySingle correctJEE Main 2021

Which of the following reagent is used for the following reaction ?

\mathrm{CH_3CH_2CH_3 \xrightarrow{\;?\;} CH_3CH_2CHO}

(A)Potassium permanganate
(B)Molybdenum oxide
(C)Copper at high temperature and pressure
(D)Manganese acetate

Q157·ChemistrySingle correctJEE Main 2021

Which of the following reagent is suitable for the preparation of the product in the above reaction.

(A)Red P + $Cl_{2}$
(B) $NH_{2}-NH_{2}/C_{2}H_{5}O^{\ominus}Na^{\oplus}$
(C) $Ni/H_{2}$
(D) $NaBH_{4}$

Q158·ChemistrySingle correctJEE Main 2021

Wich one of the following carbonyl compounds cannot be prepared by addition of wate on an alkyne in the presence of

HgSO_{4}

and

H_{2}SO_{4}

?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q159·ChemistryMultiple correctJEE Advanced 2020

In the reaction scheme shown below Q, R and S are the major products. The correct structure of

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q160·ChemistrySingle correctJEE Main 2020

The correct match between Item-I (starting material) and Item-II (reagent) for the preparation of benzaldehyde is:

Item-I	Item-II
I.Benzene	P.HCl and SnCl $_2$ , H $_3$ O $^+$
II.Benzonitrile	Q.H $_2$ , Pd-BaSO $_4$ , S and quinoline
III.Benzoyl Chloride	R.CO, HCl and AlCl $_3$

(A)(I) − (Q), (II) − (R) and (III) − (P)
(B)(I) − (P), (II) − (Q) and (III) − (R)
(C)(I) − (R), (II) − (P) and (III) − (Q)
(D)(I) − (R), (II) − (Q) and (III) − (P)

Q161·ChemistrySingle correctJEE Main 2020

The major product of the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q162·ChemistrySingle correctJEE Main 2020

In the following reaction sequence the major products A and B are:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q163·ChemistrySingle correctJEE Main 2020

The increasing order of the acidity of the

\alpha

-hydrogen of the following compounds is:

(A)(C) < (A) < (B) < (D)
(B)(B) < (C) < (A) < (D)
(C)(D) < (C) < (A) < (B)
(D)(A) < (C) < (D) < (B)

Q164·ChemistrySingle correctJEE Main 2020

The compound A in the following reactions is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q165·ChemistryNumericalJEE Main 2020

Consider the following reactions The mass percentage of carbon in A is____.

Q166·ChemistrySingle correctJEE Main 2020

Identify (A) in the following reaction sequence:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q167·ChemistrySingle correctJEE Main 2019

The major products of the following reaction are: (1) CHCl

_3

/aq. NaOH (2) HCHO, NaOH(conc.) (3) H

_3

O

^+

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q168·ChemistrySingle correctJEE Main 2019

Major products of the following reaction are: + HCHO

\xrightarrow{\text{(i) 50\% NaOH, (ii) H}_3\text{O}^{+}}

(A)CH $_3$ OH and HCO $_2$ H
(B)(B)
(C)(C)
(D)(D)

Q169·ChemistrySingle correctJEE Main 2019

Compound A (C

_9

H

_{10}

O) shows positive iodoform test. Oxidation of A with KMnO

_4

/KOH gives acid B(C

_8

H

_6

O

_4

). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:-

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q170·ChemistrySingle correctJEE Main 2019

In the following reaction Carbonyl compound + MeOH

\overset{\text{HCl}}{\rightleftharpoons}

acetal Rate of the reaction is the highest for:

(A)Acetone as substrate and methanol in stoichiometric amount
(B)Proponal as substrate and methanol in stoichiometric amount
(C)Acetone as substrate and methanol in excess
(D)Propanal as substrate and methanol in excess

Q171·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q172·ChemistrySingle correctJEE Main 2019

Which of the following compounds will show the maximum 'enol' content?

(A) $CH_{3}COCH_{3}$
(B) $CH_{3}COCH_{2}CONH_{2}$
(C) $CH_{3}COCH_{2}COCH_{3}$
(D) $CH_{3}COCH_{2}COOC_{2}H_{5}$

Q173·ChemistrySingle correctJEE Main 2019

The major product of the following reaction

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q174·ChemistrySingle correctJEE Main 2019

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q175·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q176·ChemistrySingle correctJEE Main 2019

The major product obtained in the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q177·ChemistrySingle correctJEE Main 2019

The aldehydes which will not form Grignard product with one equivalent Grignard reagents are:

(A)(b), (d)
(B)(b), (c)
(C)(b), (c), (d)
(D)(c), (d)

Q178·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q179·ChemistrySingle correctJEE Main 2019

In the following reactions, products A and B are:

\xrightarrow{dil\ NaOH}

[A] [A]

\xrightarrow[\Delta]{H_3O^+}

[B]

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q180·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q181·ChemistrySingle correctJEE Main 2019

In the following reaction Aldehyde + Alcohol

\xrightarrow{HCl}

Acetal The best combination is

Aldehyde	Alcohol
HCHO	$^tBuOH$
$CH_3CHO$	MeOH

(A) $CH_3CHO$ and $^tBuOH$
(B)HCHO and MeOH
(C) $CH_3CHO$ and MeOH
(D)HCHO and $^tBuOH$

Q182·ChemistrySingle correctJEE Main 2019

The major product 'X' formed in the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q183·ChemistrySingle correctJEE Main 2019

The major product formed in the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q184·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is:

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q185·ChemistrySingle correctJEE Main 2019

The major product of the following reaction is R

-

C

\equiv

N

\xrightarrow[(2)\ H_{2}O]{(1)\ AlH(i-Bu)_{2}}

?

(A)RCOOH
(B)RCONH $_{2}$
(C)RCHO
(D)RCH $_{2}$ NH $_{2}$

Q186·ChemistrySingle correctJEE Advanced 2018

The desired product X can be prepared by reacting the major product of the reactions in LIST-I with one or more appropriate reagents in LIST-II. (Given, order of migratory aptitude: aryl > alkyl > hydrogen) The correct option is

LIST-I	LIST-II
P.see figure	1. $I_{2}$ , NaOH
Q.see figure	2. $[Ag(NH_{3})_{2}]OH$
R.see figure	3.Fehling solution
S.see figure	4.HCHO, NaOH
	5.NaOBr

(A)P $\rightarrow$ 1; Q $\rightarrow$ 2,3; R $\rightarrow$ 1,4; S $\rightarrow$ 2,4
(B)P $\rightarrow$ 1,5; Q $\rightarrow$ 3,4; R $\rightarrow$ 4,5; S $\rightarrow$ 3
(C)P $\rightarrow$ 1,5; Q $\rightarrow$ 3,4; R $\rightarrow$ 5; S $\rightarrow$ 2,4
(D)P $\rightarrow$ 1,5; Q $\rightarrow$ 2,3; R $\rightarrow$ 1,5; S $\rightarrow$ 2,3

Q187·ChemistrySingle correctJEE Advanced 2018

PARAGRAPH "X" Treatment of benzene with CO/HCl in the presence of anhydrous

AlCl_{3}

/CuCl followed by reaction with

Ac_{2}O

/NaOAc gives compound X as the major product. Compound X upon reaction with

Br_{2}

/

Na_{2}CO_{3}

, followed by heating at 473 K with moist KOH furnishes Y as the major product. Reaction of X with

H_{2}

/Pd-C, followed by

H_{3}PO_{4}

treatment gives Z as the major product. (There are two questions based on PARAGRAPH "X", the question given below is one of them) The compound Z is

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q188·ChemistrySingle correctJEE Advanced 2017

Answer by appropriately matching the information given in the three columns of the following table. Columns 1, 2 and 3 contain starting materials, reaction conditions, and type of reactions, respectively. For the synthesis of benzoic acid, the only CORRECT combination is

Column 1	Column 2	Column 3
(I) Toluene	(i) $NaOH/Br_{2}$	(P) Condensation
(II) Acetophenone	(ii) $Br_{2}/h\nu$	(Q) Carboxylation
(III) Benzaldehyde	(iii) $(CH_{3}CO)_{2}O/CH_{3}COOK$	(R) Substitution
(IV) Phenol	(iv) $NaOH/CO_{2}$	(S) Haloform

(A)(III) (iv) (R)
(B)(IV)(ii) (P)
(C)(I) (iv) (Q)
(D)(II) (i) (S)

Q189·ChemistrySingle correctJEE Advanced 2017

Answer by appropriately matching the information given in the three columns of the following table. Columns 1, 2 and 3 contain starting materials, reaction conditions, and type of reactions, respectively. The only CORRECT combination that gives two different carboxylic acids is

Column 1	Column 2	Column 3
(I) Toluene	(i) $NaOH/Br_{2}$	(P) Condensation
(II) Acetophenone	(ii) $Br_{2}/h\nu$	(Q) Carboxylation
(III) Benzaldehyde	(iii) $(CH_{3}CO)_{2}O/CH_{3}COOK$	(R) Substitution
(IV) Phenol	(iv) $NaOH/CO_{2}$	(S) Haloform

(A)(IV) (iii) (Q)
(B)(III) (iii) (P)
(C)(II) (iv) (R)
(D)(I) (i) (S)

Q190·ChemistrySingle correctJEE Advanced 2017

PARAGRAPH 2 The reaction of compound P with

\mathrm{CH_{3}MgBr}

(excess) in

\mathrm{(C_{2}H_{5})_{2}O}

followed by addition of

\mathrm{H_{2}O}

gives Q. The compound Q on treatment with

\mathrm{H_{2}SO_{4}}

at 0

^{\circ}

C gives R. The reaction of R with

\mathrm{CH_{3}COCl}

in the presence of anhydrous

\mathrm{AlCl_{3}}

in

\mathrm{CH_{2}Cl_{2}}

followed by treatment with

\mathrm{H_{2}O}

produces compound S [Et in compound P is ethyl group] The product S is

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q191·ChemistryMultiple correctJEE Advanced 2017

Compounds P and R upon ozonolysis produce Q and S, respectively. The molecular formula of Q and S is

\mathrm{C_{8}H_{8}O}

. Q undergoes Cannizzaro reaction but not haloform reaction, whereas S undergoes haloform reaction but not Cannizzaro reaction. The option(s) with suitable combination of P and R, respectively, is(are)