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Electronic Effects and Stability — JEE Previous Year Questions

Every Electronic Effects and Stability question asked in JEE Main and JEE Advanced across the last 186 papers — 83 questions, each with its correct answer. Free to read, no account needed.

Questions

83

Papers it appeared in

74/186

Appearance rate

40%

All 83 Electronic Effects and Stability questions

Most recent papers first.

Q1·ChemistrySingle correctJEE Main 2026
Shown below is the structure of methyl acetate with three different α, β and γ carbon - oxygen bonds. The correct order of bond lengths of these bonds is :
  1. (A)α>β>γ\alpha > \beta > \gammaα>β>γ
  2. (B)α<β<γ\alpha < \beta < \gammaα<β<γ
  3. (C)α=β=γ\alpha = \beta = \gammaα=β=γ
  4. (D)α<β=γ\alpha < \beta = \gammaα<β=γ

Correct answer: (B)

Step-by-step solution →
Q2·ChemistrySingle correctJEE Main 2026
Given below are two statements: Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is CH3−>CH3-CH2−>(CH3)2CH−>(CH3)3C−\mathrm{CH_3^-} > \mathrm{CH_3\text{-}CH_2^-} > \mathrm{(CH_3)_2CH^-} > \mathrm{(CH_3)_3C^-}CH3−​>CH3​-CH2−​>(CH3​)2​CH−>(CH3​)3​C−. Statement II: Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect. In the light of the above statements, choose the correct answer from the options given below
  1. (A)Both Statement I and Statement II are correct
  2. (B)Both Statement I and Statement II are incorrect
  3. (C)Statement I is correct but Statement II is incorrect
  4. (D)Statement I is incorrect but Statement II is correct

Correct answer: (C)

Step-by-step solution →
Q3·ChemistrySingle correctJEE Main 2026
The following structures are
  1. (A)enantiomers.
  2. (B)identical molecules.
  3. (C)diastereomers.
  4. (D)meso compounds.

Correct answer: (B)

Step-by-step solution →
Q4·ChemistrySingle correctJEE Main 2026
Consider the following molecules/species: (x)(x)(x) tropone, (y)(y)(y) acetone, (z)(z)(z) acetate ion The correct order of carbon – oxygen double bond length is:
  1. (A)x>y>zx > y > zx>y>z
  2. (B)y>z>xy > z > xy>z>x
  3. (C)z>x>yz > x > yz>x>y
  4. (D)x>z>yx > z > yx>z>y

Correct answer: (C)

Step-by-step solution →
Q5·ChemistrySingle correctJEE Main 2026
Increasing order of electron withdrawing power of following functional groups is: a. −CN-CN−CN b. −COOH-COOH−COOH c. −NO2-NO_2−NO2​ d. −I-I−I
  1. (A)c<b<d<ac < b < d < ac<b<d<a
  2. (B)c<a<b<dc < a < b < dc<a<b<d
  3. (C)d<b<a<cd < b < a < cd<b<a<c
  4. (D)a<b<c<da < b < c < da<b<c<d

Correct answer: (C)

Step-by-step solution →
Q6·ChemistrySingle correctJEE Main 2026
For the given molecule, "xxx", the preferred site for the attack of the electrophile is :
  1. (A)Predominantly at "r"
  2. (B)"r" and "u"
  3. (C)"p" and "s"
  4. (D)Predominantly at "u"

Correct answer: (D)

Step-by-step solution →
Q7·ChemistrySingle correctJEE Main 2026
Given below are two statements: Statement I: In O2N-C6H4-CH⊕-C6H4-OCH3O_2N\text{-}C_6H_4\text{-}CH^{\oplus}\text{-}C_6H_4\text{-}OCH_3O2​N-C6​H4​-CH⊕-C6​H4​-OCH3​, the carbocation is stabilised by +R+R+R effect of −OCH3-OCH_3−OCH3​ group. Statement II: In O2N-C6H4-CH⊖-C6H4-OCH3O_2N\text{-}C_6H_4\text{-}CH^{\ominus}\text{-}C_6H_4\text{-}OCH_3O2​N-C6​H4​-CH⊖-C6​H4​-OCH3​, the carbanion is stabilised by −R-R−R effect of −NO2-NO_2−NO2​ group. In the light of the above statements, choose the correct answer from the options given below:
  1. (A)Both Statement I and Statement II are true
  2. (B)Both Statement I and Statement II are false
  3. (C)Statement I is true but Statement II is false
  4. (D)Statement I is false but Statement II is true

Correct answer: (A)

Step-by-step solution →
Q8·ChemistrySingle correctJEE Main 2026
CORRECT order of stability for the following is CH2_{2}2​ = CH−^{-}−, CH3_{3}3​ – CH2−_{2}^{-}2−​, CH ≡ C−^{-}−
  1. (A)CH3_{3}3​ – CH2−_{2}^{-}2−​ > CH2_{2}2​ = CH−^{-}− > CH ≡ C−^{-}−
  2. (B)CH2_{2}2​ = CH−^{-}− > CH ≡ C−^{-}− > CH3_{3}3​ – CH2−_{2}^{-}2−​
  3. (C)CH ≡ C−^{-}− > CH2_{2}2​ = CH−^{-}− > CH3_{3}3​ – CH2−_{2}^{-}2−​
  4. (D)CH ≡ C−^{-}− > CH3_{3}3​ – CH2−_{2}^{-}2−​ > CH2_{2}2​ = CH−^{-}−

Correct answer: (C)

Step-by-step solution →
Q9·ChemistrySingle correctJEE Main 2026
The cyclic cations having the same number of hyperconjugation are : Choose the correct answer from the options given below :
  1. (A)A and C Only
  2. (B)B and C Only
  3. (C)A and B Only
  4. (D)A, C and D only

Correct answer: (A)

Step-by-step solution →
Q10·ChemistrySingle correctJEE Main 2026
Arrange the following carbanions in the decreasing order of stability I. p−Br−C6H4−C⊖H2p-\mathrm{Br}-\mathrm{C_6H_4}-\overset{\ominus}{\mathrm{C}}\mathrm{H_2}p−Br−C6​H4​−C⊖H2​ II. C6H5−C⊖H2\mathrm{C_6H_5}-\overset{\ominus}{\mathrm{C}}\mathrm{H_2}C6​H5​−C⊖H2​ III. p−CH3O−C6H4−C⊖H2p-\mathrm{CH_3O}-\mathrm{C_6H_4}-\overset{\ominus}{\mathrm{C}}\mathrm{H_2}p−CH3​O−C6​H4​−C⊖H2​ IV. p−CHO−C6H4−C⊖H2p-\mathrm{CHO}-\mathrm{C_6H_4}-\overset{\ominus}{\mathrm{C}}\mathrm{H_2}p−CHO−C6​H4​−C⊖H2​ V. p−CH3−C6H4−C⊖H2p-\mathrm{CH_3}-\mathrm{C_6H_4}-\overset{\ominus}{\mathrm{C}}\mathrm{H_2}p−CH3​−C6​H4​−C⊖H2​ Choose the correct answer from the options given below :
  1. (A)I > II > IV > V > III
  2. (B)I > IV > II > V > III
  3. (C)IV > I > II > V > III
  4. (D)IV > II > I > III > V

Correct answer: (C)

Step-by-step solution →
Q11·ChemistrySingle correctJEE Main 2026
Arrange the following alkenes in decreasing order of stability. Choose the correct answer from the options given below :
  1. (A)III > I > II > IV
  2. (B)III > II > I > IV
  3. (C)I > III > II > IV
  4. (D)I > III > IV > II

Correct answer: (C)

Step-by-step solution →
Q12·ChemistrySingle correctJEE Main 2026
Find out the statements which are not true. A. Resonating structure with more number of covalent bonds and lesser charge separation are more stable. B. In electromeric effect, an unsaturated system shows + E effect with nucleophile and –E effect with electrophile. C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds. D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation. E. Stability of carbanion increases with the increase in s-character of the carbon carrying the negative charge. Choose the correct answer from the options given below.
  1. (A)A, D & E only
  2. (B)B, D & E only
  3. (C)A, C & D only
  4. (D)B & D only

Correct answer: (D)

Step-by-step solution →
Q13·ChemistrySingle correctJEE Main 2026
Given below are two statements: Statement I: (CH3)3C⊕\left(\mathrm{CH_{3}}\right)_{3}\overset{\oplus}{\mathrm{C}}(CH3​)3​C⊕ is more stable than C⊕H3\overset{\oplus}{\mathrm{C}}\mathrm{H_{3}}C⊕H3​ as nine hyperconjugation interactions are possible in (CH3)3C⊕\left(\mathrm{CH_{3}}\right)_{3}\overset{\oplus}{\mathrm{C}}(CH3​)3​C⊕. Statement II: C⊕H3\overset{\oplus}{\mathrm{C}}\mathrm{H_{3}}C⊕H3​ is less stable than (CH3)3C⊕\left(\mathrm{CH_{3}}\right)_{3}\overset{\oplus}{\mathrm{C}}(CH3​)3​C⊕ as only three hyperconjugation interactions are possible in C⊕H3\overset{\oplus}{\mathrm{C}}\mathrm{H_{3}}C⊕H3​. In the light of the above statements, choose the correct answer from the options given below.
  1. (A)Statement I is true but Statement II is false
  2. (B)Both Statement I and Statement II are true
  3. (C)Both Statement I and Statement II are false
  4. (D)Statement I is false but Statement II is true

Correct answer: (A)

Step-by-step solution →
Q14·ChemistrySingle correctJEE Main 2026
From the following, the least stable structure is :
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (C)

Step-by-step solution →
Q15·ChemistrySingle correctJEE Main 2026
Given below are two statements : Statement −-− I : Compound (X), shown below , dissolves in NaHCO3\text{NaHCO}_{3}NaHCO3​ solution and has two chiral carbon atoms Statement −-− II : Compound (Y), shown below, has two carbons with sp3\text{sp}^{3}sp3 hybridization, one carbon with sp2\text{sp}^{2}sp2 and one carbon with sp hybridization In the light of the above statements, choose the correct answer from the options given below :
  1. (A)Statement I is true but Statement II is false
  2. (B)Statement I is false but Statement II is true
  3. (C)Both Statement I and Statement II are true
  4. (D)Both Statement I and Statement II are false

Correct answer: (C)

Step-by-step solution →
Q16·ChemistrySingle correctJEE Main 2025
Which of the following compounds (shown in the figure) is least likely to give effervescence of CO2_22​ in presence of aq. NaHCO3_33​?
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (D)

Step-by-step solution →
Q17·ChemistrySingle correctJEE Main 2025
Given below are two statements: Statement (I): cis-1,2-dichloroethene is more polar than cis-1,2-dibromoethene. Statement (II): Boiling point of trans-1,2-dibromoethene is lower than cis-1,2-dibromoethene but it is more polar than cis-1,2-dibromoethene. In the light of the above statements, choose the most appropriate answer from the options given below:
  1. (A)Statement I is correct but statement II is incorrect
  2. (B)Statement I is incorrect but statement II is correct
  3. (C)Both statement I and statement II are incorrect
  4. (D)Both statement I and statement II are correct

Correct answer: (A)

Step-by-step solution →
Q18·ChemistrySingle correctJEE Main 2025
In which pairs, the first ion is more stable than the second?
  1. (A)(B) & (D) only
  2. (B)(A) & (B) only
  3. (C)(B) & (C) only
  4. (D)(A) & (C) only

Correct answer: (B)

Step-by-step solution →
Q19·ChemistrySingle correctJEE Main 2025
Given below are two statements. Statement I: The dipole moment of C4H3−C3H=C2H−C1H=O\overset{4}{C}H_3-\overset{3}{C}H=\overset{2}{C}H-\overset{1}{C}H=OC4H3​−C3H=C2H−C1H=O is greater than C4H3−C3H2−C2H2−C1H=O\overset{4}{C}H_3-\overset{3}{C}H_2-\overset{2}{C}H_2-\overset{1}{C}H=OC4H3​−C3H2​−C2H2​−C1H=O. Statement II: C1−C2C_1-C_2C1​−C2​ bond length of C4H3−C3H=C2H−C1H=O\overset{4}{C}H_3-\overset{3}{C}H=\overset{2}{C}H-\overset{1}{C}H=OC4H3​−C3H=C2H−C1H=O is greater than C1−C2C_1-C_2C1​−C2​ bond length of C4H3−C3H2−C2H2−C1H=O\overset{4}{C}H_3-\overset{3}{C}H_2-\overset{2}{C}H_2-\overset{1}{C}H=OC4H3​−C3H2​−C2H2​−C1H=O. In the light of the above statements, choose the correct answer from the options given below:
  1. (A)Statement I is false but Statement II is true
  2. (B)Both Statement I and Statement II are false
  3. (C)Statement I is true but Statement II is false
  4. (D)Both Statement I and Statement II are true

Correct answer: (C)

Step-by-step solution →
Q20·ChemistrySingle correctJEE Main 2025
Identify the correct statements from the following (the structures for statements A–D are shown in the figure): A. ...are metamers; B. ...are functional isomers; C. ...are position isomers; D. ...are homologous. Choose the correct answer from the options given below:
  1. (A)(C) & (D) only
  2. (B)(B) & (C) only
  3. (C)(A) & (B) only
  4. (D)(A), (B) & (C) only

Correct answer: (C)

Step-by-step solution →
Q21·ChemistrySingle correctJEE Main 2025
Given below are two statements: Statement I: Hyperconjugation is not a permanent effect. Statement II: In general, greater the number of alkyl groups attached to a positively charged C-atom, greater is the hyperconjugation interaction and stabilization of the cation. In the light of the above statements, choose the correct answer from the options given below:
  1. (A)Statement I is true but Statement II is false
  2. (B)Both Statement I and Statement II are false
  3. (C)Statement I is false but Statement II is true
  4. (D)Both Statement I and Statement II are true

Correct answer: (C)

Step-by-step solution →
Q22·ChemistrySingle correctJEE Main 2025
Consider the compound (X): H−C≡C−CH2−CH(CH3)−CH3H-C\equiv C-CH_2-CH(CH_3)-CH_3H−C≡C−CH2​−CH(CH3​)−CH3​, whose C–H bonds are labelled I (at the ≡C−H\equiv C-H≡C−H), II (at the CH2CH_2CH2​), III (at the CHCHCH) and IV (at the CH3CH_3CH3​). The most stable and least stable carbon radicals, respectively, produced by homolytic cleavage of the corresponding C–H bond are:
  1. (A)II, IV
  2. (B)III, II
  3. (C)I, IV
  4. (D)II, I

Correct answer: (D)

Step-by-step solution →
Q23·ChemistrySingle correctJEE Main 2025
The correct order of stability of following carbocations is (the carbocations A, B, C, D are shown in the figure):
  1. (A)A > B > C > D
  2. (B)B > C > A > D
  3. (C)C > B > A > D
  4. (D)C > A > B > D

Correct answer: (D)

Step-by-step solution →
Q24·ChemistrySingle correctJEE Main 2025
Which one of the carbocations from the following is most stable ?
  1. (A)C+H2−CH=CH−CH2−O−CH3\overset{+}{C}H_2-CH=CH-CH_2-O-CH_3C+H2​−CH=CH−CH2​−O−CH3​
  2. (B)C+H2−CH=CH−O−CH3\overset{+}{C}H_2-CH=CH-O-CH_3C+H2​−CH=CH−O−CH3​
  3. (C)C+H2−CH=CH−O−CO−CH3\overset{+}{C}H_2-CH=CH-O-CO-CH_3C+H2​−CH=CH−O−CO−CH3​
  4. (D)C+H2−CH=CH−F\overset{+}{C}H_2-CH=CH-FC+H2​−CH=CH−F

Correct answer: (B)

Step-by-step solution →
Q25·ChemistrySingle correctJEE Main 2025
Identify correct statement/s : (A) −OCH3-OCH_3−OCH3​ and −NHCOCH3-NHCOCH_3−NHCOCH3​ are activating group (B) −CN-CN−CN and −OH-OH−OH are meta directing group (C) −CN-CN−CN and −SO3H-SO_3H−SO3​H are meta directing group (D) Activating groups act as ortho- and para- directing groups (E) Halides are activating groups. Choose the correct answer from the options given below :
  1. (A)(A), (C) and (D) only
  2. (B)(A), (B) and (D) only
  3. (C)(A) only
  4. (D)(A) and (C) only

Correct answer: (A)

Step-by-step solution →
Q26·ChemistrySingle correctJEE Main 2025
The correct stability order of the following species/molecules is :
  1. (A)q > r > p
  2. (B)r > q > p
  3. (C)q > p > r
  4. (D)p > q > r

Correct answer: (A)

Step-by-step solution →
Q27·ChemistrySingle correctJEE Main 2025
The most stable carbocation from the following is:
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (A)

Step-by-step solution →
Q28·ChemistrySingle correctJEE Main 2024
The correct stability order of the following resonance structures of CH3−CH=CH−CHOCH_3-CH=CH-CHOCH3​−CH=CH−CHO (labelled I, II and III in the figure) is:
  1. (A)II > III > I
  2. (B)III > II > I
  3. (C)I > II > III
  4. (D)II > I > III

Correct answer: (B)

Step-by-step solution →
Q29·ChemistryNumericalJEE Main 2024
How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects?

Correct answer: 4

Step-by-step solution →
Q30·ChemistrySingle correctJEE Main 2024
Relative stability of the contributing structures is : (I) CH2=CH−C(=O)−HCH_2=CH-C(=O)-HCH2​=CH−C(=O)−H ; (II) CH2−CH=C(O−)−HCH_2-CH=C(O^-)-HCH2​−CH=C(O−)−H (with + charge on terminal CH2CH_2CH2​) ; (III) CH2−CH=C(O+)−HCH_2-CH=C(O^+)-HCH2​−CH=C(O+)−H (with carbanion lone pair on terminal CH2CH_2CH2​)
  1. (A)(I) > (III) > (II)
  2. (B)(I) > (II) > (III)
  3. (C)(II) > (I) > (III)
  4. (D)(III) > (II) > (I)

Correct answer: (B)

Step-by-step solution →
Q31·ChemistrySingle correctJEE Main 2024
In the given compound CH3−C∣CH3∣H−CH∣H−C∣CH3∣H−CH3CH_3-\underset{\underset{H}{|}}{\overset{\overset{CH_3}{|}}{C}}-\underset{\underset{H}{|}}{CH}-\underset{\underset{H}{|}}{\overset{\overset{CH_3}{|}}{C}}-CH_3CH3​−H∣​C∣CH3​​​−H∣​CH​−H∣​C∣CH3​​​−CH3​ (2,4-dimethylpentane), the number of 2∘2^\circ2∘ carbon atom/s is:
  1. (A)Three
  2. (B)One
  3. (C)Two
  4. (D)Four

Correct answer: (B)

Step-by-step solution →
Q32·ChemistrySingle correctJEE Main 2024
The shape of carbocation is:
  1. (A)trigonal planar
  2. (B)diagonal pyramidal
  3. (C)tetrahedral
  4. (D)diagonal

Correct answer: (A)

Step-by-step solution →
Q33·ChemistryNumericalJEE Main 2024
Number of carbocation from the following (shown in the figure) that are not stabilized by hyperconjugation is _______.

Correct answer: 5

Step-by-step solution →
Q34·ChemistrySingle correctJEE Main 2024
Which among the following is incorrect statement?
  1. (A)Electromeric effect dominates over inductive effect
  2. (B)The electromeric effect is a temporary effect
  3. (C)The organic compound shows electromeric effect in the presence of the reagent only
  4. (D)Hydrogen ion (H+)(H^+)(H+) shows negative electromeric effect

Correct answer: (D)

Step-by-step solution →
Q35·ChemistrySingle correctJEE Main 2024
The correct order of stability of the carbanions a, b, c and d (shown in the figure) is
  1. (A)c>b>d>ac>b>d>ac>b>d>a
  2. (B)a>b>c>da>b>c>da>b>c>d
  3. (C)d>c>b>ad>c>b>ad>c>b>a
  4. (D)d>c>a>bd>c>a>bd>c>a>b

Correct answer: (D)

Step-by-step solution →
Q36·ChemistrySingle correctJEE Main 2024
What will be the decreasing order of basic strength of the following conjugate bases? −OH^-OH−OH, RO−RO^-RO−, CH3COO−CH_3COO^-CH3​COO−, Cl−Cl^-Cl−
  1. (A)Cl > OH > R O > CH3COO
  2. (B)RO >–OH > CH3CO O > Cl
  3. (C)–OH > RO > CH3 COO > Cl
  4. (D)Cl > RO > –OH > CH3CO O

Correct answer: (B)

Step-by-step solution →
Q37·ChemistrySingle correctJEE Main 2024
Match List-I (electronic-effect mechanism steps) with List-II (the electronic effect). Choose the correct answer from the options given below:
List-I (Mechanism step)List-II (Effect)
A.see figureI.−E-E−E effect
B.see figureII.−R-R−R effect
C.see figureIII.+E+E+E effect
D.see figureIV.+R+R+R effect
  1. (A)(A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  2. (B)(A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  3. (C)(A)-(II), (B)-(IV), (C)-(III), (D)-(I)
  4. (D)(A)-(I), (B)-(II), (C)-(IV), (D)-(III)

Correct answer: (A)

Step-by-step solution →
Q38·ChemistrySingle correctJEE Main 2024
The set of meta directing functional groups from the following sets is:
  1. (A)−CN-\text{CN}−CN, −NH2-\text{NH}_2−NH2​, −NHR-\text{NHR}−NHR, −OCH3-\text{OCH}_3−OCH3​
  2. (B)−NO2-\text{NO}_2−NO2​, −NH2-\text{NH}_2−NH2​, −COOH-\text{COOH}−COOH, −COOR-\text{COOR}−COOR
  3. (C)−NO2-\text{NO}_2−NO2​, −CHO-\text{CHO}−CHO, −SO3H-\text{SO}_3\text{H}−SO3​H, −COR-\text{COR}−COR
  4. (D)−CN-\text{CN}−CN, −CHO-\text{CHO}−CHO, −NHCOCH3-\text{NHCOCH}_3−NHCOCH3​, −COOR-\text{COOR}−COOR

Correct answer: (C)

Step-by-step solution →
Q39·ChemistrySingle correctJEE Main 2024
Which of the following compound will most easily be attacked by an electrophile?
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (D)

Step-by-step solution →
Q40·ChemistrySingle correctJEE Main 2024
The functional group that shows negative resonance effect is:
  1. (A)−NH2-\text{NH}_2−NH2​
  2. (B)−OH-\text{OH}−OH
  3. (C)−COOH-\text{COOH}−COOH
  4. (D)−OR-\text{OR}−OR

Correct answer: (C)

Step-by-step solution →
Q41·ChemistryNumericalJEE Main 2024
Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is ___

Correct answer: 2

Step-by-step solution →
Q42·ChemistrySingle correctJEE Main 2024
The correct order of reactivity in electrophilic substitution reaction of the following compounds (A: benzene, B: methylbenzene, C: chlorobenzene, D: nitrobenzene, shown in the figure) is:
  1. (A)B > C > A > D
  2. (B)D > C > B > A
  3. (C)A > B > C > D
  4. (D)B > A > C > D

Correct answer: (D)

Step-by-step solution →
Q43·ChemistrySingle correctJEE Main 2024
Which of the following molecule/species is most stable?
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (A)

Step-by-step solution →
Q44·ChemistrySingle correctJEE Main 2024
The correct stability order of carbocations is:
  1. (A)(CH3)3C+>CH3−C+H2>(CH3)2C+H>C+H3(CH_3)_3C^+ > CH_3-\overset{+}{C}H_2 > (CH_3)_2\overset{+}{C}H > \overset{+}{C}H_3(CH3​)3​C+>CH3​−C+H2​>(CH3​)2​C+H>C+H3​
  2. (B)C+H3>(CH3)2C+H>CH3−C+H2>(CH3)3C+\overset{+}{C}H_3 > (CH_3)_2\overset{+}{C}H > CH_3-\overset{+}{C}H_2 > (CH_3)_3\overset{+}{C}C+H3​>(CH3​)2​C+H>CH3​−C+H2​>(CH3​)3​C+
  3. (C)(CH3)3C+>(CH3)2C+H>CH3−C+H2>C+H3(CH_3)_3\overset{+}{C} > (CH_3)_2\overset{+}{C}H > CH_3-\overset{+}{C}H_2 > \overset{+}{C}H_3(CH3​)3​C+>(CH3​)2​C+H>CH3​−C+H2​>C+H3​
  4. (D)C+H3>CH3−C+H2>(CH3)2C+H>(CH3)3C+\overset{+}{C}H_3 > CH_3-\overset{+}{C}H_2 > (CH_3)_2\overset{+}{C}H > (CH_3)_3\overset{+}{C}C+H3​>CH3​−C+H2​>(CH3​)2​C+H>(CH3​)3​C+

Correct answer: (C)

Step-by-step solution →
Q45·ChemistrySingle correctJEE Main 2024
The interaction between π\piπ bond and lone pair of electrons present on an adjacent atom is responsible for
  1. (A)Hyperconjugation
  2. (B)Inductive effect
  3. (C)Electromeric effect
  4. (D)Resonance effect

Correct answer: (D)

Step-by-step solution →
Q46·ChemistrySingle correctJEE Main 2024
The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is
  1. (A)electromeric energy
  2. (B)resonance energy
  3. (C)ionization energy
  4. (D)hyperconjugation energy

Correct answer: (B)

Step-by-step solution →
Q47·ChemistrySingle correctJEE Main 2024
The ascending acidity order of the following H atoms is:
  1. (A)C < D < B < A
  2. (B)A < B < C < D
  3. (C)A < B < D < C
  4. (D)D < C < B < A

Correct answer: (A)

Step-by-step solution →
Q48·ChemistrySingle correctJEE Main 2024
The order of relative stability of the contributing structures (I, II and III) is :
  1. (A)I > II > III
  2. (B)II > I > III
  3. (C)I = II = III
  4. (D)III > II > I

Correct answer: (A)

Step-by-step solution →
Q49·ChemistryNumericalJEE Main 2024
Among the following, total number of meta directing functional groups is (Integer based): −OCH3-\text{OCH}_3−OCH3​, −NO2-\text{NO}_2−NO2​, −CN-\text{CN}−CN, −CH3-\text{CH}_3−CH3​, −NHCOCH3-\text{NHCOCH}_3−NHCOCH3​, −COR-\text{COR}−COR, −OH-\text{OH}−OH, −COOH-\text{COOH}−COOH, −Cl-\text{Cl}−Cl.

Correct answer: 4

Step-by-step solution →
Q50·ChemistrySingle correctJEE Main 2024
Which of the following has highly acidic hydrogen?
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (D)

Step-by-step solution →
Q51·ChemistrySingle correctJEE Main 2023
Decreasing order of reactivity towards electrophilic substitution for the following compounds is: (a) toluene, (b) benzene, (c) 1-(trifluoromethyl)... (a benzene ring with CF3), (d) anisole (benzene with OCH3), (e) N,N-dimethylaniline (benzene with NMe2).
  1. (A)c > b > a > d > e
  2. (B)e > d > a > b > c
  3. (C)a > d > e > b > c
  4. (D)d > a > e > c > b

Correct answer: (B)

Step-by-step solution →
Q52·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: Order of acidic nature of the following compounds is A > B > C. Reason R: Fluoro is a stronger electron withdrawing group than Chloro group. In the light of the above statements, choose the correct answer from the options given below:
  1. (A)A is false but R is true
  2. (B)Both A and R are correct and R is the correct explanation of A
  3. (C)Both A and R are correct but R is NOT the correct explanation of A
  4. (D)A is true but R is false

Correct answer: (C)

Step-by-step solution →
Q53·ChemistrySingle correctJEE Main 2023
Among the following compounds, the one which shows highest dipole moment is:
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (A)

Step-by-step solution →
Q54·ChemistrySingle correctJEE Main 2023
Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction:
  1. (A)d, b, c, a
  2. (B)b, c, a, d
  3. (C)c, a, b, d
  4. (D)d, b, a, c

Correct answer: (C)

Step-by-step solution →
Q55·ChemistrySingle correctJEE Main 2023
The decreasing order of hydride affinity for the following carbocations (A, B, C, D shown in the figure) is:
  1. (A)A, C, B, D
  2. (B)C, A, B, D
  3. (C)C, A, D, B
  4. (D)A, C, D, B

Correct answer: (B)

Step-by-step solution →
Q56·ChemistrySingle correctJEE Main 2023
The strongest acid from the following is
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (A)

Step-by-step solution →
Q57·ChemistrySingle correctJEE Main 2023
What is the correct order of acidity of the protons marked A-D in the given compounds?
  1. (A)HC>HA>HD>HBH_C>H_A>H_D>H_BHC​>HA​>HD​>HB​
  2. (B)HD>HC>HB>HAH_D>H_C>H_B>H_AHD​>HC​>HB​>HA​
  3. (C)HC>HD>HB>HAH_C>H_D>H_B>H_AHC​>HD​>HB​>HA​
  4. (D)HC>HD>HA>HBH_C>H_D>H_A>H_BHC​>HD​>HA​>HB​

Correct answer: (D)

Step-by-step solution →
Q58·ChemistrySingle correctJEE Main 2023
The most stable carbocation for the following (structures a, b, c, d shown in the figure) is:
  1. (A)a
  2. (B)c
  3. (C)d
  4. (D)b

Correct answer: (C)

Step-by-step solution →
Q59·ChemistrySingle correctJEE Main 2023
Which will undergo deprotonation most readily in basic medium?
  1. (A)c only
  2. (B)a only
  3. (C)Both a and c
  4. (D)b only

Correct answer: (B)

Step-by-step solution →
Q60·ChemistrySingle correctJEE Main 2023
Increasing order of stability of the resonance structures (A, B, C, D shown in the figure) is:
  1. (A)D, C, A, B
  2. (B)D, C, B, A
  3. (C)C, D, A, B
  4. (D)C, D, B, A

Correct answer: (A)

Step-by-step solution →
Q61·ChemistrySingle correctJEE Main 2022
Given below are two statements. Statement I and Statement II are shown in the figure. In the light of the above statement, choose the most appropriate answer from the options given below.
  1. (A)Both Statement I and Statement II are correct
  2. (B)Both Statement I and Statement II are incorrect.
  3. (C)Statement I is correct but Statement II is incorrect.
  4. (D)Statement I is incorrect but Statement II is correct.

Correct answer: (C)

Step-by-step solution →
Q62·ChemistrySingle correctJEE Main 2022
Among the following marked proton of which compound shows lowest pKa_aa​ value ?
  1. (A)(A)
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (C)

Step-by-step solution →
Q63·ChemistrySingle correctJEE Main 2022
Which of the following carbocations is most stable :
  1. (A)(A)
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (D)

Step-by-step solution →
Q64·ChemistrySingle correctJEE Main 2022
Which of the following is most stable?
  1. (A)(A)
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (A)

Step-by-step solution →
Q65·ChemistrySingle correctJEE Advanced 2021
The amount of energy required to break a bond is same as the amount of energy released when the same bond is formed. In gaseous state, the energy required for homolytic cleavage of a bond is called Bond Dissociation Energy (BDE) or Bond Strength. BDE is affected by s-character of the bond and the stability of the radicals formed. Shorter bonds are typically stronger bonds. BDEs for some bonds are given below : H3_{3}3​C–H(g) → H3_{3}3​C∙^{\bullet}∙(g) + H∙^{\bullet}∙(g) ΔH°=105 kcal mol−1^{-1}−1 Cl–Cl(g) → Cl∙^{\bullet}∙(g) + Cl∙^{\bullet}∙(g) ΔH°=58 kcal mol−1^{-1}−1 H3_{3}3​C–Cl(g) → H3_{3}3​C∙^{\bullet}∙(g) + Cl∙^{\bullet}∙(g) ΔH°=85 kcal mol−1^{-1}−1 H–Cl(g) → H∙^{\bullet}∙(g) + Cl∙^{\bullet}∙(g) ΔH°=103 kcal mol−1^{-1}−1 Correct match of the C\mathbf{C}C–H\mathbf{H}H bonds (shown in bold) in Column J\mathbf{J}J with their BDE in Column K\mathbf{K}K is Column J\mathbf{J}J — Molecule | Column K\mathbf{K}K — BDE (kcal mol−1^{-1}−1) (P) H\mathbf{H}H–CH\mathbf{CH}CH(CH3_{3}3​)2_{2}2​ | (i) 132 (Q) H–CH2\mathbf{CH_{2}}CH2​Ph | (ii) 110 (R) H\mathbf{H}H–CH\mathbf{CH}CH=CH2_{2}2​ | (iii) 95 (S) H–C\mathbf{C}C≡CH | (iv) 88
  1. (A)P – iii, Q – iv, R – ii, S – i
  2. (B)P – i, Q – ii, R – iii, S – iv
  3. (C)P – iii, Q – ii, R –i, S – iv
  4. (D)P – ii, Q – i, R – iv, S – iii

Correct answer: (A)

Step-by-step solution →
Q66·ChemistrySingle correctJEE Main 2021
The correct order of stability of given carbocations is:
  1. (A)A > C > B > D
  2. (B)D > B > C > A
  3. (C)C > A > D > B
  4. (D)D > B > A > C

Correct answer: (A)

Step-by-step solution →
Q67·ChemistrySingle correctJEE Main 2021
Given below are two statements: Statement I : Hyper conjugation is permanent effect. Statement II : Hyper conjugation in ethyl cation (CH3_33​−C+^++H2_22​) involves the overlapping of Csp2^22−H1s_{1s}1s​ bond with empty 2p orbital of other carbon. Choose the correct option:
  1. (A)Statement I is incorrect but Statement II is true.
  2. (B)Statement I is correct but Statement II is false.
  3. (C)Both Statement I and Statement II are false.
  4. (D)Both Statement I and Statement II are true.

Correct answer: (B)

Step-by-step solution →
Q68·ChemistrySingle correctJEE Main 2021
Which one among the following resonating structure is not correct?
  1. (A)(A)
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (B)

Step-by-step solution →
Q69·ChemistrySingle correctJEE Main 2021
Which among the following is the strongest acid?
  1. (A)CH3CH2CH2CH3CH_3CH_2CH_2CH_3CH3​CH2​CH2​CH3​
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (C)

Step-by-step solution →
Q70·ChemistrySingle correctJEE Main 2021
Which one of the following compounds does not exhibit resonance?
  1. (A)CH3CH2CH2CONH2CH_{3}CH_{2}CH_{2}CONH_{2}CH3​CH2​CH2​CONH2​
  2. (B)CH3CH2CH=CHCH2NH2CH_{3}CH_{2}CH = CHCH_{2}NH_{2}CH3​CH2​CH=CHCH2​NH2​
  3. (C)CH3CH2OCH=CH2CH_{3}CH_{2}OCH = CH_{2}CH3​CH2​OCH=CH2​
  4. (D)(D)

Correct answer: (B)

Step-by-step solution →
Q71·ChemistrySingle correctJEE Main 2021
Among the given species the Resonance stabilized carbocations are:
  1. (A)(A), (B) and (C) only
  2. (B)(C) and (D) only
  3. (C)(A), (B) and (D) only
  4. (D)(A) and (B) only

Correct answer: (D)

Step-by-step solution →
Q72·ChemistrySingle correctJEE Main 2021
Choose the correct statement regarding the formation of carbocations A and B given :-
  1. (A)Carbocation B is more stable and formed relatively at faster rate
  2. (B)Carbocation A is more stable and formed relatively at slow rate
  3. (C)Carbocation B is more stable and formed relatively at slow rate
  4. (D)Carbocation A is more stable and formed relatively at faster rate

Correct answer: (A)

Step-by-step solution →
Q73·ChemistryMultiple correctJEE Advanced 2020
With respect to the compounds I-V, choose the correct statement(s).
  1. (A)The acidity of compound I is due to delocalization in the conjugate base.
  2. (B)The conjugate base of compound IV is aromatic.
  3. (C)Compound II becomes more acidic, when it has a −NO2-NO_2−NO2​ substituent.
  4. (D)The acidity of compounds follows the order I > IV > V > II > III.

Correct answer: (A), (B), (C)

Step-by-step solution →
Q74·ChemistrySingle correctJEE Main 2020
Which one of the following compounds possesses the most acidic hydrogen?
  1. (A)H3_33​C −-− C ≡\equiv≡ C −-− H
  2. (B)(B)
  3. (C)(C)
  4. (D)(D)

Correct answer: (B)

Step-by-step solution →
Q75·ChemistrySingle correctJEE Main 2020
Which of the following has the shortest C–Cl bond?
  1. (A)Cl – CH = CH – NO2_22​
  2. (B)Cl – CH = CH – OCH3_33​
  3. (C)Cl – CH = CH – CH3_33​
  4. (D)Cl – CH = CH2_22​

Correct answer: (A)

Step-by-step solution →
Q76·ChemistrySingle correctJEE Main 2020
The correct order of stability for the following alkoxides is
  1. (A)(B) > (C) > A
  2. (B)(C) > (A) > (B)
  3. (C)(C) > (B) > (A)
  4. (D)(B) > (A) > (C)

Correct answer: (C)

Step-by-step solution →
Q77·ChemistrySingle correctJEE Advanced 2019
The correct order of acid strength of the following carboxylic acids is
  1. (A)I > III > II > IV
  2. (B)III > II > I > IV
  3. (C)I > II > III > IV
  4. (D)II > I > IV > III

Correct answer: (C)

Step-by-step solution →
Q78·ChemistrySingle correctJEE Main 2019
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is:
  1. (A)(III) < (I) < (II)
  2. (B)(III) < (II) < (I)
  3. (C)(II) < (I) < (III)
  4. (D)(I) < (III) < (II)

Correct answer: (A)

Step-by-step solution →
Q79·ChemistrySingle correctJEE Main 2019
The increasing order of reactivity of thefollowing compounds towards aromatic electrophilic substitution reaction is
  1. (A)D < B < A < C
  2. (B)A < B < C < D
  3. (C)D < A < C < B
  4. (D)B < C < A < D

Correct answer: (C)

Step-by-step solution →
Q80·ChemistrySingle correctJEE Main 2019
In the following compound, the favourable site/s for protonation is/are
  1. (A)a and e
  2. (B)b, c and d
  3. (C)a and d
  4. (D)a

Correct answer: (B)

Step-by-step solution →
Q81·ChemistrySingle correctJEE Main 2019
Which amongst the following is the strongest acid?
  1. (A)CHBr3_{3}3​
  2. (B)CHI3_{3}3​
  3. (C)CH(CN)3_{3}3​
  4. (D)CHCl3_{3}3​

Correct answer: (C)

Step-by-step solution →
Q82·ChemistryIntegerJEE Advanced 2015
The number of resonance structures for N\mathbf{N}N is

Correct answer: 9

Step-by-step solution →
Q83·ChemistryMultiple correctJEE Advanced 2013
The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to
  1. (A)σ→p (empty) and σ→π* electron delocalisations.
  2. (B)σ→σ* and σ→π electron delocalisations.
  3. (C)σ→p (filled) and σ→π electron delocalisations.
  4. (D)p(filled)→σ* and σ→π* electron delocalisations.

Correct answer: (A)

Step-by-step solution →

Electronic Effects and Stability — frequently asked

How many questions from Electronic Effects and Stability appear in JEE?

Electronic Effects and Stability has appeared in 74 of the last 186 JEE Main and JEE Advanced papers — about 40% of them — contributing 83 questions in total across those papers.

Is Electronic Effects and Stability an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 40% 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 Electronic Effects and Stability 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.

Other Chemistry chapters

  • Coordination Compounds 318
  • p-Block Elements 276
  • Redox Reactions and Electrochemistry 265
  • Chemical Bonding and Molecular Structure 207
  • d- and f-Block Elements 202
  • Aldehydes and Ketones 199
  • Equilibrium 199
  • Solutions 198

All 36 Chemistry chapters →

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