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Isomerism

Previous year questions with solutions · 2024 – 2026

33Questions
27Papers covered
1.89%Weightage 2026▲ 12.5% vs last year
’24
’25
’26
Year-wise statistics questions · papers · average per paper · weightage
YearQuestionsPapersAvg / paperWeightage
20269190.471.89% ▲ 12.5% vs last year
20258190.421.68% ▼ 36.8% vs last year
202416200.82.67%

33 questions · newest paper first · page 1 of 2

Ques. 1JEE Main 2026, 6 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 2JEE Main 2026, 4 April (Evening Shift)

The following structures are : [figure]

  1. enantiomers.
  2. identical molecules.
  3. diastereomers.
  4. meso compounds.
Ques. 3JEE Main 2026, 2 April (Morning Shift)

Consider the isomers of hydrocarbon with molecular formula C5H10. These isomers do not decolourise KMnO4 solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is .

Ques. 4JEE Main 2026, 24 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are true
Ques. 5JEE Main 2026, 23 January (Morning Shift)

Consider all the structural isomers with molecular formula C5H11Br are separately treated with KOH(aq) to give respective substitution products, without any rearrangement. The number of products which can exhibit optical isomerism from these is .

Ques. 6JEE Main 2026, 21 January (Morning Shift)

Identify correct statements from the following : Choose the correct answer from the options given below :

  1. A, B and E only
  2. A, B and C only
  3. C, D and E only
  4. B, C and D only
Ques. 7JEE Main 2026, 21 January (Evening Shift)

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

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
Ques. 8JEE Main 2026, 21 January (Evening Shift)

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

  1. A-III, B-I, C-IV, D-II
  2. A-II, B-I, C-IV, D-III
  3. A-I, B-IV, C-III, D-II
  4. A-III, B-I, C-II, D-IV
Ques. 9JEE Main 2026, 21 January (Evening Shift)

Given below are four compounds : (a) n-propyl chloride (b) isopropyl chloride (c) sec-butyl chloride (d) neopentyl chloride Percentage of carbon in the one which exhibits optical isomerism is :

  1. 46
  2. 40
  3. 52
  4. 56
Ques. 10JEE Main 2025, 7 April (Evening Shift)

The number of optically active products obtained from the complete ozonolysis of the given compound is : [figure]

  1. 4
  2. 0
  3. 2
  4. 1
Ques. 11JEE Main 2025, 7 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Both Statement I and Statement II are correct
  2. Statement I is incorrect but Statement II is correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
Ques. 12JEE Main 2025, 3 April (Morning Shift)

Identify the correct statements from the following. Choose the correct answer from the options given below:

  1. B & C Only
  2. C & D Only
  3. A,B & C Only
  4. A & B Only
Ques. 13JEE Main 2025, 3 April (Evening Shift)

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C9H12 is .

Ques. 14JEE Main 2025, 28 January (Evening Shift)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false
Ques. 15JEE Main 2025, 24 January (Evening Shift)

The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is .

Ques. 16JEE Main 2025, 22 January (Morning Shift)

How many different stereoisomers are possible for the given molecule? [figure]

  1. 2
  2. 1
  3. 3
  4. 4
Ques. 17JEE Main 2025, 22 January (Morning Shift)

The incorrect statements regarding geometrical isomerism are : Choose the correct answer from the options given below :

  1. A and E Only
  2. A, D and E Only
  3. C, D and E Only
  4. B and C Only
Ques. 18JEE Main 2024, 9 April (Evening Shift)

Total number of stereo isomers possible for the given structure : [figure]

  1. 4
  2. 2
  3. 8
  4. 3
Ques. 19JEE Main 2024, 8 April (Morning Shift)

The number of optical isomers in following compound is : . [figure]

Ques. 20JEE Main 2024, 8 April (Evening Shift)

The number of optically active compounds from the following is . [figure] CH3-CH2-CH2-CH2-OH, CH3-CH2- Cl |CH-CH3, CH3-CH2-CH2-CH2-Cl, (CH3)2CH-CH2-CH2-Cl

Ques. 21JEE Main 2024, 6 April (Morning Shift)

Which of the following is metamer of the given compound (X) ? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 22JEE Main 2024, 6 April (Evening Shift)

The incorrect statement regarding the geometrical isomers of 2-butene is :

  1. cis-2-butene and trans-2-butene are not interconvertible at room temperature.
  2. trans-2-butene is more stable than cis-2-butene.
  3. cis-2-butene has less dipole moment than trans-2-butene.
  4. cis-2-butene and trans-2-butene are stereoisomers.
Ques. 23JEE Main 2024, 5 April (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

  1. (A) is true but (R) is false
  2. (A) is false but (R) is true
  3. Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
Ques. 24JEE Main 2024, 5 April (Evening Shift)

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

  1. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  2. (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. (A)-(I), (B)-(III), (C)-(IV), (D)-(II)
Ques. 25JEE Main 2024, 4 April (Morning Shift)

The number of different chain isomers for C7H16 is .

Ques. 26JEE Main 2024, 1 February (Morning Shift)

Number of optical isomers possible for 2-chlorobutane .

Ques. 27JEE Main 2024, 1 February (Evening Shift)

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is .

Ques. 28JEE Main 2024, 30 January (Evening Shift)

Number of geometrical isomers possible for the given structure is/are . [figure]

Ques. 29JEE Main 2024, 30 January (Evening Shift)

2-chlorobutane + Cl2 C4H8Cl2 (isomers) Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is .

Ques. 30JEE Main 2024, 29 January (Evening Shift)

Which one of the following will show geometrical isomerism?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]