Diazonium Salts and Reactions — JEE Previous Year Questions

Every Diazonium Salts and Reactions question asked in JEE Main and JEE Advanced across the last 186 papers — 58 questions, each with its correct answer. Free to read, no account needed.

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Papers it appeared in

53/186

Appearance rate

28%

All 58 Diazonium Salts and Reactions questions

Most recent papers first.

Q1·ChemistryMultiple correctJEE Advanced 2026

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

(A)Q on treatment with ethanol generates an aromatic aldehyde.
(B)S gives positive phthalein dye test.
(C)P is a dinitro compound.
(D)T is a coloured compound.

Q2·ChemistryNumericalJEE Main 2026

Consider the following sequence of reactions. The percentage of nitrogen in the yellow product (X) formed is _______%. (Nearest Integer) (Given Molar mass in g mol⁻¹ H:1, C:12, N:14)

Q3·ChemistrySingle correctJEE Main 2026

Product

C

of the following reaction sequence will be

(A)1-Bromo-4-nitrobenzene
(B)1, 3, 5-Tribromo-2-nitrobenzene
(C)4-Bromo-1-nitrobenzene
(D)1, 3, 5-Tribromobenzene

Q4·ChemistrySingle correctJEE Main 2026

Identify compounds A and E in the following reaction sequence.

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

Q5·ChemistrySingle correctJEE Main 2026

The correct stability order of the following diazonium salts is

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

Q6·ChemistrySingle correctJEE Main 2026

'A' is a neutral organic compound (M. F : C

_8

_9

ON ). On treatment with aqueous Br

_2

/HO

^{(-)}

, 'A' forms a compound 'B' which is soluble in dilute acid. 'B' on treatment with aqueous NaNO

_2

/HCl(0–5°C) produces a compound 'C' which on treatment with CuCN/NaCN produces 'D' Hydrolysis of 'D' produces 'E' which is also obtainable from the hydrolysis of 'A'. 'E' on treatment with acidified KMnO

_4

produces 'F'. 'F' contains two different types of hydrogen atoms. The structure of 'A' is

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

Q7·ChemistrySingle correctJEE Main 2026

(1)

\text{Br}_{2}/\text{FeBr}_{3}/\Delta

(2)

\text{Sn}/\text{HCl}/\Delta

(3) pH neutralisation (4)

\text{Br}_{2}/\text{H}_{2}\text{O}

(5)

\text{NaNO}_{2}/\text{HBr}

, 0-5

^{\circ}

C (6)

\text{CuBr}/\text{NaBr}

\rightarrow

Major Product (P) Consider the above sequence of reactions. The number of bromine atom(s) in the final product (P) will be:

(A)1
(B)6
(C)5
(D)3

Q8·ChemistrySingle correctJEE Main 2025

Identify [A], [B] and [C], respectively in the following reaction sequence (shown in the figure):

[A]\xrightarrow{NaNO_2,\,HCl,\,273\text{-}278K}[\text{benzenediazonium chloride}]\xrightarrow{KI}[B]\xrightarrow{2Na,\,\text{Dry ether}}[C]

. Choose the correct option (the structure sets are shown in the figure):

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

Q9·ChemistrySingle correctJEE Main 2025

When a concentrated solution of sulphanilic acid and 1-naphthylamine is treated with nitrous acid (273 K) and acidified with acetic acid, the mass (g) of 0.1 mole of product formed is: (Given molar mass in g mol

^{-1}

— H:1, C:12, N:14, O:16, S:32)

(A)343
(B)330
(C)33
(D)66

Q10·ChemistrySingle correctJEE Main 2025

Which one of the following reaction sequences (shown in the figure) will give an azo dye?

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

Q11·ChemistryIntegerJEE Main 2025

Consider the following sequence of reactions to produce major product (A). The starting compound (shown in the figure) is treated successively with: i) Br₂, Fe; ii) Sn, HCl; iii) NaNO₂, HCl, 273 K; iv) H₃PO₂, H₂O. Molar mass of product (A) is _______ g mol

^{-1}

. (Given molar mass in g mol

^{-1}

of C : 12, H : 1, O : 16, Br : 80, N : 14, P : 31)

Q12·ChemistryIntegerJEE Main 2025

Consider the following sequence of reactions starting from 4-ethoxyaniline:

\xrightarrow{\text{(i) }NaNO_2,\,HCl,\,0\text{-}5^\circ C;\ \text{(ii) }HCl\,(dil)}[A]\xrightarrow{\text{(i) phenol, }NaOH;\ \text{(ii) }HCl\,(dil)}[B]\ (C_{14}H_{14}N_2O_2)\xrightarrow{\text{(i) }NaOH;\ \text{(ii) }H_3CCH_2Br}[C]\ (C_{16}H_{18}N_2O_2)

. Total number of sp

^3

hybridised carbon atoms in the major product C formed is __________.

Q13·ChemistrySingle correctJEE Main 2025

Nitrobenzene is subjected to the reaction sequence (i) Br₂, AcOH; (ii) Sn, HCl; (iii) NaNO₂, HCl, 273 K; (iv) C₂H₅OH, giving products A and B. Identify A and B. (See figure for the option structures.)

(A)3-bromophenol and 3-bromophenetole
(B)3-bromophenetole and CH₃COOH
(C)bromobenzene and CH₃CHO
(D)3-bromophenol and CH₃CHO

Q14·ChemistryIntegerJEE Main 2025

Consider the following sequence of reactions on nitrobenzene: (i) Sn + HCl; (ii) NaNO₂, HCl, 0 °C; (iii) Cu₂Cl₂; (iv) Na, ether. The molar mass of the product A formed is ______ g mol⁻¹.

Q15·ChemistryNumericalJEE Main 2024

279\,g

of aniline is reacted with one equivalent of benzenediazonium chloride, the maximum amount of aniline yellow formed will be ___ g. (nearest integer) (consider complete conversion)

Q16·ChemistryNumericalJEE Main 2024

9.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/conversion) is _______ g (nearest integer).

Q17·ChemistrySingle correctJEE Main 2024

Identify the major product (A) in the reaction sequence shown in the figure.

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

Q18·ChemistrySingle correctJEE Main 2024

The azo-dye (Y) formed in the following reactions is (shown in the figure).

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

Q19·ChemistryNumericalJEE Advanced 2023

PARAGRAPH II A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of

\mathrm{NaNO_2}

/HCl at

0^\circ

C provides

\mathbf{P}

as the product.

\mathbf{P}

, upon treatment with excess of

\mathrm{H_2O}

at room temperature, gives the product

\mathbf{Q}

. Bromination of

\mathbf{Q}

in aqueous medium furnishes the product

\mathbf{R}

. The compound

\mathbf{P}

upon treatment with an excess of phenol under basic conditions gives the product

\mathbf{S}

. The molar mass difference between compounds

\mathbf{Q}

and

\mathbf{R}

is 474 g mol

^{-1}

and between compounds

\mathbf{P}

and

\mathbf{S}

is 172.5 g mol

^{-1}

. The number of heteroatoms present in one molecule of

\mathbf{R}

is ______ . [Use: Molar mass (in g mol-1): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

Q20·ChemistryNumericalJEE Advanced 2023

PARAGRAPH II A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of

\mathrm{NaNO_2}

/HCl at

0^\circ

C provides

\mathbf{P}

as the product.

\mathbf{P}

, upon treatment with excess of

\mathrm{H_2O}

at room temperature, gives the product

\mathbf{Q}

. Bromination of

\mathbf{Q}

in aqueous medium furnishes the product

\mathbf{R}

. The compound

\mathbf{P}

upon treatment with an excess of phenol under basic conditions gives the product

\mathbf{S}

. The molar mass difference between compounds

\mathbf{Q}

and

\mathbf{R}

is 474 g mol

^{-1}

and between compounds

\mathbf{P}

and

\mathbf{S}

is 172.5 g mol

^{-1}

. The total number of carbon atoms and heteroatoms present in one molecule of

\mathbf{S}

is ______ . [Use: Molar mass (in g mol

^{-1}

): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

Q21·ChemistrySingle correctJEE Main 2023

Consider the following sequence of reactions: aniline (

C_6H_5NH_2

) with

NaNO_2

0-5\,^{\circ}C

gives 'A', then 'A' with N,N-Dimethylaniline gives 'B'. The product 'B' is

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

Q22·ChemistrySingle correctJEE Main 2023

In the above conversion the correct sequence of reagents to be added is (the conversion shown is 4-nitrotoluene to 2-bromo-4-chlorobenzoic acid).

(A)(i) $Fe/H^+$ , (ii) HONO, (iii) CuCl, (iv) $KMnO_4$ , (v) $Br_2$
(B)(i) $KMnO_4$ , (ii) $Br_2/Fe$ , (iii) $Fe/H^+$ , (iv) $Cl_2$
(C)(i) $Br_2/Fe$ , (ii) $Fe/H^+$ , (iii) HONO, (iv) CuCl, (v) $KMnO_4$
(D) $Br_2/Fe$ , (ii) $Fe/H^+$ , (iii) $KMnO_4$ , (iv) $Cl_2$

Q23·ChemistrySingle correctJEE Main 2023

Compound A from the following reaction sequence is:

(A)Benzoic Acid
(B)Phenol
(C)Salicylic Acid
(D)Aniline

Q24·ChemistrySingle correctJEE Main 2023

In the following reaction sequence, compound 'B' is (choose the correct structure from the options shown in the figure):

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

Q25·ChemistrySingle correctJEE Main 2023

o-Phenylenediamine reacts with

HNO_2

to give the major product 'X'. 'X' is

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

Q26·ChemistrySingle correctJEE Main 2023

The product (P) formed from the following multistep reaction is:

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

Q27·ChemistrySingle correctJEE Main 2023

Benzenediazonium chloride is reacted with reagents in List-I to form products in List-II. Match List-I (Reagent) with List-II (Product). Choose the correct answer:

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

Q28·ChemistrySingle correctJEE Main 2023

For the conversion of compound (X) = 4-nitrotoluene to product (Y) = 3,5-dibromotoluene, the sequence of reagents to be used will be:

(A)(i) $Br_2(aq)$ (ii) $LiAlH_4$ (iii) $H_3O^+$
(B)(i) $Br_2$ , Fe (ii) Fe, $H^+$ (iii) $LiAlH_4$
(C)(i) Fe, $H^+$ (ii) $Br_2(aq)$ (iii) $HNO_2$ (iv) $H_3PO_2$
(D)(i) Fe, $H^+$ (ii) $Br_2(aq)$ (iii) $HNO_2$ (iv) CuBr

Q29·ChemistrySingle correctJEE Main 2023

Identify the products (intermediate A and final product E) in the reaction sequence carried out on 4-nitrotoluene:

Br_2

; then

Sn/HCl

; then

NaNO_2/HCl

at 273-278 K; then

H_3PO_2/H_2O

; then

KMnO_4/KOH

H^+

. (Option structures shown in the figure.)

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

Q30·ChemistrySingle correctJEE Main 2023

Choose the correct colour of the product for the following reaction.

(A)White
(B)Red
(C)Blue
(D)Yellow

Q31·ChemistryMultiple correctJEE Advanced 2022

Considering the following reaction sequence, the correct option(s) is(are)

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

Q32·ChemistrySingle correctJEE Main 2022

Which among the following represent reagent 'A'?

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

Q33·ChemistrySingle correctJEE Main 2022

The correct stability order of the following diazonium salt is

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

Q34·ChemistrySingle correctJEE Main 2022

Hydrolysis of which compound will give carbolic acid ?

(A)Cumene
(B)Benzenediazonium chloride
(C)Benzal chloride
(D)Ethylene glycol ketal

Q35·ChemistrySingle correctJEE Main 2022

The correct sequential order of the reagents for the given reaction is :

(A) $HNO_{2}$ , $Fe/H^{+}$ , $HNO_{2}$ , KI, $H_{2}O/H^{+}$
(B) $HNO_{2}$ , KI, $Fe/H^{+}$ , $HNO_{2}$ , $H_{2}O$ /warm
(C) $HNO_{2}$ , KI, $HNO_{2}$ , $Fe/H^{+}$ , $H_{2}O/H^{+}$
(D) $HNO_{2}$ , $Fe/H^{+}$ , KI, $HNO_{2}$ , $H_{2}O$ /warm

Q36·ChemistrySingle correctJEE Main 2022

The final product 'C' is the following series series of reactions

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

Q37·ChemistrySingle correctJEE Main 2021

Which one of the following gives the most stable Diazonium salt ?

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

Q38·ChemistrySingle correctJEE Main 2021

The correct sequence of correct reagent for the following transformation is:

(A)(i) Cl $_2$ ,FeCl $_3$ (ii) NaNO $_2$ ,HCl,0° C (iii) Fe,HCl (iv) H $_2$ O/H $^+$
(B)(i) Cl $_2$ ,FeCl $_3$ (ii) Fe,HCl (iii) NaNO $_2$ ,HCl,0° C (iv) H $_2$ O/H $^+$
(C)(i) Fe,HCl (ii) Cl $_2$ ,HCl (iii) NaNO $_2$ ,HCl,0° C (iv) H $_2$ O/H $^+$
(D)(i) Fe,HCl (ii) NaNO $_2$ ,HCl,0° C (iii) H $_2$ O/H $^+$ (iv) Cl $_2$ ,FeCl $_3$

Q39·ChemistrySingle correctJEE Main 2021

Consider the above reaction, the product "P" is:

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

Q40·ChemistrySingle correctJEE Main 2021

In the chemical reactions given above A and B respectively are:

(A) $CH_{3}CH_{2}OH$ and $H_{3}PO_{2}$
(B) $CH_{3}CH_{2}Cl$ and $H_{3}PO_{2}$
(C) $H_{3}PO_{2}$ and $CH_{3}CH_{2}OH$
(D) $H_{3}PO_{2}$ and $CH_{3}CH_{2}Cl$

Q41·ChemistrySingle correctJEE Main 2021

Consider the above reaction, compound B is :

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

Q42·ChemistrySingle correctJEE Main 2021

Considering the above reaction, X and Y respectively are :

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

Q43·ChemistrySingle correctJEE Main 2021

In the above reaction, the structural formula of (A), "X" and "Y" respectively are :

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

Q44·ChemistrySingle correctJEE Main 2021

In the above chemical reaction, intermediate "X" and reagent/condition "A" are :

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

Q45·ChemistrySingle correctJEE Main 2021

'A' and 'B' in the following reactions are :

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

Q46·ChemistrySingle correctJEE Main 2021

The diazonium salt of which of the following compounds will form a coloured dye on reaction with

\beta

-Naphthol in NaOH ?

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

Q47·ChemistrySingle correctJEE Main 2021

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene ?

(A) $\xrightarrow{Sn/HCl}$ / $\xrightarrow{Br_{2}}$ / $\xrightarrow{NaNO_{2}}$ / $\xrightarrow{NaBr}$
(B) $\xrightarrow{Sn/HCl}$ / $\xrightarrow{KBr}$ / $\xrightarrow{Br_{2}}$ / $\xrightarrow{H^{+}}$
(C) $\xrightarrow{NaNO_{2}}$ / $\xrightarrow{HCl}$ / $\xrightarrow{KBr}$ / $\xrightarrow{H^{+}}$
(D) $\xrightarrow{Br_{2}/Fe}$ / $\xrightarrow{Sn/HCl}$ / $\xrightarrow{NaNO_{2}/HCl}$ / $\xrightarrow{CuBr/HBr}$

Q48·ChemistryNumericalJEE Advanced 2020

Consider the reaction sequence from P to Q shown below. The overall yield of the major product Q from P is 75%. What is the amount in grams of Q obtained from 9.3 mL of P? (Use density of P = 1.00 g

mL^{-1}

, Molar mass of C = 12.0, H = 1.0, O = 16.0 and N = 14.0 g

mol^{-1}

)

Q49·ChemistrySingle correctJEE Main 2020

The major product Z obtained in the following reaction scheme is:

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

Q50·ChemistrySingle correctJEE Main 2020

Consider the following reaction:

\xrightarrow{OH^{-}}

'X' The product 'X' is used

(A)in protein estimation as an alternative to ninhydrin
(B)as food grade colourant
(C)in laboratory test for phenols
(D)in acid-base titration as an indicator

Q51·ChemistryNumericalJEE Advanced 2019

Schemes 1 and 2 describe the conversion of P to Q and R to S, respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is

Q52·ChemistrySingle correctJEE Main 2019

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

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

Q53·ChemistrySingle correctJEE Main 2019

Aniline dissolved in dilute HCl is reacted with sodium nitrite at

0^{\circ}C

. This solution was added dropwise to a solution containing equimolar mixture of aniline and phenol in dil. HCl. The structure of the major product is:

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

Q54·ChemistrySingle correctJEE Main 2019

Coupling of benzene diazonium chloride with 1 – naphthol in alkaline medium will give:

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

Q55·ChemistrySingle correctJEE Advanced 2017

The major product of the following reaction is

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

Q56·ChemistryMultiple correctJEE Advanced 2016

The product(s) of the following reaction sequence is (are)

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

Q57·ChemistryMultiple correctJEE Advanced 2015

In the following reactions, the major product

\mathbf{W}

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

Q58·ChemistrySingle correctJEE Advanced 2014

For the identification of

\beta

-naphthol using dye test, it is necessary to use

(A)dichloromethane solution of $\beta$ -naphthol.
(B)acidic solution of $\beta$ -naphthol.
(C)neutral solution of $\beta$ -naphthol.
(D)alkaline solution of $\beta$ -naphthol.

Diazonium Salts and Reactions — frequently asked

How many questions from Diazonium Salts and Reactions appear in JEE?

Diazonium Salts and Reactions has appeared in 53 of the last 186 JEE Main and JEE Advanced papers — about 28% of them — contributing 58 questions in total across those papers.

Is Diazonium Salts and Reactions an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 28% 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 Diazonium Salts and Reactions 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.

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All 58 Diazonium Salts and Reactions questions

Most recent papers first.

Q1·ChemistryMultiple correctJEE Advanced 2026

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

(A)Q on treatment with ethanol generates an aromatic aldehyde.
(B)S gives positive phthalein dye test.
(C)P is a dinitro compound.
(D)T is a coloured compound.

Q2·ChemistryNumericalJEE Main 2026

Consider the following sequence of reactions. The percentage of nitrogen in the yellow product (X) formed is _______%. (Nearest Integer) (Given Molar mass in g mol⁻¹ H:1, C:12, N:14)

Q3·ChemistrySingle correctJEE Main 2026

Product

C

of the following reaction sequence will be

(A)1-Bromo-4-nitrobenzene
(B)1, 3, 5-Tribromo-2-nitrobenzene
(C)4-Bromo-1-nitrobenzene
(D)1, 3, 5-Tribromobenzene

Q4·ChemistrySingle correctJEE Main 2026

Identify compounds A and E in the following reaction sequence.

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

Q5·ChemistrySingle correctJEE Main 2026

The correct stability order of the following diazonium salts is

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

Q6·ChemistrySingle correctJEE Main 2026

'A' is a neutral organic compound (M. F : C

_8

_9

ON ). On treatment with aqueous Br

_2

/HO

^{(-)}

, 'A' forms a compound 'B' which is soluble in dilute acid. 'B' on treatment with aqueous NaNO

_2

_4

produces 'F'. 'F' contains two different types of hydrogen atoms. The structure of 'A' is

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

Q7·ChemistrySingle correctJEE Main 2026

(1)

\text{Br}_{2}/\text{FeBr}_{3}/\Delta

(2)

\text{Sn}/\text{HCl}/\Delta

(3) pH neutralisation (4)

\text{Br}_{2}/\text{H}_{2}\text{O}

(5)

\text{NaNO}_{2}/\text{HBr}

, 0-5

^{\circ}

C (6)

\text{CuBr}/\text{NaBr}

\rightarrow

Major Product (P) Consider the above sequence of reactions. The number of bromine atom(s) in the final product (P) will be:

(A)1
(B)6
(C)5
(D)3

Q8·ChemistrySingle correctJEE Main 2025

Identify [A], [B] and [C], respectively in the following reaction sequence (shown in the figure):

[A]\xrightarrow{NaNO_2,\,HCl,\,273\text{-}278K}[\text{benzenediazonium chloride}]\xrightarrow{KI}[B]\xrightarrow{2Na,\,\text{Dry ether}}[C]

. Choose the correct option (the structure sets are shown in the figure):

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

Q9·ChemistrySingle correctJEE Main 2025

^{-1}

— H:1, C:12, N:14, O:16, S:32)

(A)343
(B)330
(C)33
(D)66

Q10·ChemistrySingle correctJEE Main 2025

Which one of the following reaction sequences (shown in the figure) will give an azo dye?

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

Q11·ChemistryIntegerJEE Main 2025

^{-1}

. (Given molar mass in g mol

^{-1}

of C : 12, H : 1, O : 16, Br : 80, N : 14, P : 31)

Q12·ChemistryIntegerJEE Main 2025

Consider the following sequence of reactions starting from 4-ethoxyaniline:

\xrightarrow{\text{(i) }NaNO_2,\,HCl,\,0\text{-}5^\circ C;\ \text{(ii) }HCl\,(dil)}[A]\xrightarrow{\text{(i) phenol, }NaOH;\ \text{(ii) }HCl\,(dil)}[B]\ (C_{14}H_{14}N_2O_2)\xrightarrow{\text{(i) }NaOH;\ \text{(ii) }H_3CCH_2Br}[C]\ (C_{16}H_{18}N_2O_2)

. Total number of sp

^3

hybridised carbon atoms in the major product C formed is __________.

Q13·ChemistrySingle correctJEE Main 2025

(A)3-bromophenol and 3-bromophenetole
(B)3-bromophenetole and CH₃COOH
(C)bromobenzene and CH₃CHO
(D)3-bromophenol and CH₃CHO

Q14·ChemistryIntegerJEE Main 2025

Consider the following sequence of reactions on nitrobenzene: (i) Sn + HCl; (ii) NaNO₂, HCl, 0 °C; (iii) Cu₂Cl₂; (iv) Na, ether. The molar mass of the product A formed is ______ g mol⁻¹.

Q15·ChemistryNumericalJEE Main 2024

279\,g

of aniline is reacted with one equivalent of benzenediazonium chloride, the maximum amount of aniline yellow formed will be ___ g. (nearest integer) (consider complete conversion)

Q16·ChemistryNumericalJEE Main 2024

9.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/conversion) is _______ g (nearest integer).

Q17·ChemistrySingle correctJEE Main 2024

Identify the major product (A) in the reaction sequence shown in the figure.

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

Q18·ChemistrySingle correctJEE Main 2024

The azo-dye (Y) formed in the following reactions is (shown in the figure).

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

Q19·ChemistryNumericalJEE Advanced 2023

PARAGRAPH II A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of

\mathrm{NaNO_2}

/HCl at

0^\circ

C provides

\mathbf{P}

as the product.

\mathbf{P}

, upon treatment with excess of

\mathrm{H_2O}

at room temperature, gives the product

\mathbf{Q}

. Bromination of

\mathbf{Q}

in aqueous medium furnishes the product

\mathbf{R}

. The compound

\mathbf{P}

upon treatment with an excess of phenol under basic conditions gives the product

\mathbf{S}

. The molar mass difference between compounds

\mathbf{Q}

and

\mathbf{R}

is 474 g mol

^{-1}

and between compounds

\mathbf{P}

and

\mathbf{S}

is 172.5 g mol

^{-1}

. The number of heteroatoms present in one molecule of

\mathbf{R}

is ______ . [Use: Molar mass (in g mol-1): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

Q20·ChemistryNumericalJEE Advanced 2023

PARAGRAPH II A trinitro compound, 1,3,5-tris-(4-nitrophenyl)benzene, on complete reaction with an excess of Sn/HCl gives a major product, which on treatment with an excess of

\mathrm{NaNO_2}

/HCl at

0^\circ

C provides

\mathbf{P}

as the product.

\mathbf{P}

, upon treatment with excess of

\mathrm{H_2O}

at room temperature, gives the product

\mathbf{Q}

. Bromination of

\mathbf{Q}

in aqueous medium furnishes the product

\mathbf{R}

. The compound

\mathbf{P}

upon treatment with an excess of phenol under basic conditions gives the product

\mathbf{S}

. The molar mass difference between compounds

\mathbf{Q}

and

\mathbf{R}

is 474 g mol

^{-1}

and between compounds

\mathbf{P}

and

\mathbf{S}

is 172.5 g mol

^{-1}

. The total number of carbon atoms and heteroatoms present in one molecule of

\mathbf{S}

is ______ . [Use: Molar mass (in g mol

^{-1}

): H = 1, C = 12, N = 14, O = 16, Br = 80, Cl = 35.5 Atoms other than C and H are considered as heteroatoms]

Q21·ChemistrySingle correctJEE Main 2023

Consider the following sequence of reactions: aniline (

C_6H_5NH_2

) with

NaNO_2

0-5\,^{\circ}C

gives 'A', then 'A' with N,N-Dimethylaniline gives 'B'. The product 'B' is

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

Q22·ChemistrySingle correctJEE Main 2023

In the above conversion the correct sequence of reagents to be added is (the conversion shown is 4-nitrotoluene to 2-bromo-4-chlorobenzoic acid).

(A)(i) $Fe/H^+$ , (ii) HONO, (iii) CuCl, (iv) $KMnO_4$ , (v) $Br_2$
(B)(i) $KMnO_4$ , (ii) $Br_2/Fe$ , (iii) $Fe/H^+$ , (iv) $Cl_2$
(C)(i) $Br_2/Fe$ , (ii) $Fe/H^+$ , (iii) HONO, (iv) CuCl, (v) $KMnO_4$
(D) $Br_2/Fe$ , (ii) $Fe/H^+$ , (iii) $KMnO_4$ , (iv) $Cl_2$

Q23·ChemistrySingle correctJEE Main 2023

Compound A from the following reaction sequence is:

(A)Benzoic Acid
(B)Phenol
(C)Salicylic Acid
(D)Aniline

Q24·ChemistrySingle correctJEE Main 2023

In the following reaction sequence, compound 'B' is (choose the correct structure from the options shown in the figure):

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

Q25·ChemistrySingle correctJEE Main 2023

o-Phenylenediamine reacts with

HNO_2

to give the major product 'X'. 'X' is

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

Q26·ChemistrySingle correctJEE Main 2023

The product (P) formed from the following multistep reaction is:

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

Q27·ChemistrySingle correctJEE Main 2023

Benzenediazonium chloride is reacted with reagents in List-I to form products in List-II. Match List-I (Reagent) with List-II (Product). Choose the correct answer:

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

Q28·ChemistrySingle correctJEE Main 2023

For the conversion of compound (X) = 4-nitrotoluene to product (Y) = 3,5-dibromotoluene, the sequence of reagents to be used will be:

(A)(i) $Br_2(aq)$ (ii) $LiAlH_4$ (iii) $H_3O^+$
(B)(i) $Br_2$ , Fe (ii) Fe, $H^+$ (iii) $LiAlH_4$
(C)(i) Fe, $H^+$ (ii) $Br_2(aq)$ (iii) $HNO_2$ (iv) $H_3PO_2$
(D)(i) Fe, $H^+$ (ii) $Br_2(aq)$ (iii) $HNO_2$ (iv) CuBr

Q29·ChemistrySingle correctJEE Main 2023

Identify the products (intermediate A and final product E) in the reaction sequence carried out on 4-nitrotoluene:

Br_2

; then

Sn/HCl

; then

NaNO_2/HCl

at 273-278 K; then

H_3PO_2/H_2O

; then

KMnO_4/KOH

H^+

. (Option structures shown in the figure.)

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

Q30·ChemistrySingle correctJEE Main 2023

Choose the correct colour of the product for the following reaction.

(A)White
(B)Red
(C)Blue
(D)Yellow

Q31·ChemistryMultiple correctJEE Advanced 2022

Considering the following reaction sequence, the correct option(s) is(are)

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

Q32·ChemistrySingle correctJEE Main 2022

Which among the following represent reagent 'A'?

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

Q33·ChemistrySingle correctJEE Main 2022

The correct stability order of the following diazonium salt is

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

Q34·ChemistrySingle correctJEE Main 2022

Hydrolysis of which compound will give carbolic acid ?

(A)Cumene
(B)Benzenediazonium chloride
(C)Benzal chloride
(D)Ethylene glycol ketal

Q35·ChemistrySingle correctJEE Main 2022

The correct sequential order of the reagents for the given reaction is :

(A) $HNO_{2}$ , $Fe/H^{+}$ , $HNO_{2}$ , KI, $H_{2}O/H^{+}$
(B) $HNO_{2}$ , KI, $Fe/H^{+}$ , $HNO_{2}$ , $H_{2}O$ /warm
(C) $HNO_{2}$ , KI, $HNO_{2}$ , $Fe/H^{+}$ , $H_{2}O/H^{+}$
(D) $HNO_{2}$ , $Fe/H^{+}$ , KI, $HNO_{2}$ , $H_{2}O$ /warm

Q36·ChemistrySingle correctJEE Main 2022

The final product 'C' is the following series series of reactions

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

Q37·ChemistrySingle correctJEE Main 2021

Which one of the following gives the most stable Diazonium salt ?

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

Q38·ChemistrySingle correctJEE Main 2021

The correct sequence of correct reagent for the following transformation is:

(A)(i) Cl $_2$ ,FeCl $_3$ (ii) NaNO $_2$ ,HCl,0° C (iii) Fe,HCl (iv) H $_2$ O/H $^+$
(B)(i) Cl $_2$ ,FeCl $_3$ (ii) Fe,HCl (iii) NaNO $_2$ ,HCl,0° C (iv) H $_2$ O/H $^+$
(C)(i) Fe,HCl (ii) Cl $_2$ ,HCl (iii) NaNO $_2$ ,HCl,0° C (iv) H $_2$ O/H $^+$
(D)(i) Fe,HCl (ii) NaNO $_2$ ,HCl,0° C (iii) H $_2$ O/H $^+$ (iv) Cl $_2$ ,FeCl $_3$

Q39·ChemistrySingle correctJEE Main 2021

Consider the above reaction, the product "P" is:

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

Q40·ChemistrySingle correctJEE Main 2021

In the chemical reactions given above A and B respectively are:

(A) $CH_{3}CH_{2}OH$ and $H_{3}PO_{2}$
(B) $CH_{3}CH_{2}Cl$ and $H_{3}PO_{2}$
(C) $H_{3}PO_{2}$ and $CH_{3}CH_{2}OH$
(D) $H_{3}PO_{2}$ and $CH_{3}CH_{2}Cl$

Q41·ChemistrySingle correctJEE Main 2021

Consider the above reaction, compound B is :

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

Q42·ChemistrySingle correctJEE Main 2021

Considering the above reaction, X and Y respectively are :

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

Q43·ChemistrySingle correctJEE Main 2021

In the above reaction, the structural formula of (A), "X" and "Y" respectively are :

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

Q44·ChemistrySingle correctJEE Main 2021

In the above chemical reaction, intermediate "X" and reagent/condition "A" are :

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

Q45·ChemistrySingle correctJEE Main 2021

'A' and 'B' in the following reactions are :

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

Q46·ChemistrySingle correctJEE Main 2021

The diazonium salt of which of the following compounds will form a coloured dye on reaction with

\beta

-Naphthol in NaOH ?

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

Q47·ChemistrySingle correctJEE Main 2021

What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene ?

(A) $\xrightarrow{Sn/HCl}$ / $\xrightarrow{Br_{2}}$ / $\xrightarrow{NaNO_{2}}$ / $\xrightarrow{NaBr}$
(B) $\xrightarrow{Sn/HCl}$ / $\xrightarrow{KBr}$ / $\xrightarrow{Br_{2}}$ / $\xrightarrow{H^{+}}$
(C) $\xrightarrow{NaNO_{2}}$ / $\xrightarrow{HCl}$ / $\xrightarrow{KBr}$ / $\xrightarrow{H^{+}}$
(D) $\xrightarrow{Br_{2}/Fe}$ / $\xrightarrow{Sn/HCl}$ / $\xrightarrow{NaNO_{2}/HCl}$ / $\xrightarrow{CuBr/HBr}$

Q48·ChemistryNumericalJEE Advanced 2020

Consider the reaction sequence from P to Q shown below. The overall yield of the major product Q from P is 75%. What is the amount in grams of Q obtained from 9.3 mL of P? (Use density of P = 1.00 g

mL^{-1}

, Molar mass of C = 12.0, H = 1.0, O = 16.0 and N = 14.0 g

mol^{-1}

)

Q49·ChemistrySingle correctJEE Main 2020

The major product Z obtained in the following reaction scheme is:

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

Q50·ChemistrySingle correctJEE Main 2020

Consider the following reaction:

\xrightarrow{OH^{-}}

'X' The product 'X' is used

(A)in protein estimation as an alternative to ninhydrin
(B)as food grade colourant
(C)in laboratory test for phenols
(D)in acid-base titration as an indicator

Q51·ChemistryNumericalJEE Advanced 2019

Schemes 1 and 2 describe the conversion of P to Q and R to S, respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is

Q52·ChemistrySingle correctJEE Main 2019

Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives :

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

Q53·ChemistrySingle correctJEE Main 2019

Aniline dissolved in dilute HCl is reacted with sodium nitrite at

0^{\circ}C

. This solution was added dropwise to a solution containing equimolar mixture of aniline and phenol in dil. HCl. The structure of the major product is:

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

Q54·ChemistrySingle correctJEE Main 2019

Coupling of benzene diazonium chloride with 1 – naphthol in alkaline medium will give:

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

Q55·ChemistrySingle correctJEE Advanced 2017

The major product of the following reaction is

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

Q56·ChemistryMultiple correctJEE Advanced 2016

The product(s) of the following reaction sequence is (are)

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

Q57·ChemistryMultiple correctJEE Advanced 2015

In the following reactions, the major product

\mathbf{W}

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

Q58·ChemistrySingle correctJEE Advanced 2014

For the identification of

\beta

-naphthol using dye test, it is necessary to use

(A)dichloromethane solution of $\beta$ -naphthol.
(B)acidic solution of $\beta$ -naphthol.
(C)neutral solution of $\beta$ -naphthol.
(D)alkaline solution of $\beta$ -naphthol.

Diazonium Salts and Reactions — frequently asked

How many questions from Diazonium Salts and Reactions appear in JEE?

Diazonium Salts and Reactions has appeared in 53 of the last 186 JEE Main and JEE Advanced papers — about 28% of them — contributing 58 questions in total across those papers.

Is Diazonium Salts and Reactions an important chapter for JEE?

Where do these Diazonium Salts and Reactions 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.