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Isomerism · Question 6

JEE Main 2026 (Online) 21st January Morning ShiftMCQEasy📈 Topic in 23% papers+4−1
1

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

Answer

(1) A, B and E only

Solution

A. CH3CH2CHO (aldehyde) and CH3COCH3 (ketone), both C3H6O functional isomers. Correct.

B. C2H5-O-C2H5 and CH3-O-C3H7, both C4H10O, differ in the alkyl groups on either side of –O– metamers. Correct.

C. But-2-ene has no chiral carbon; it shows geometrical (cis-trans) isomerism, not optical isomerism. Incorrect.

D. But-1-ene and but-2-ene differ only in the position of the double bond position isomers. Incorrect.

E. CH3(CH2)3CH3 and C(CH3)4, both C5H12, differ in the carbon chain chain isomers. Correct.

A, B and E only.

Answer: (1)

JEE Main 2026 (Online) 21st January Morning Shift

Keep practising — Isomerism

2

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
JEE Main 2026 (Online) 21st January Evening Shift
3

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
JEE Main 2026 (Online) 21st January Evening Shift
4

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
JEE Main 2026 (Online) 21st January Evening Shift
5

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
JEE Main 2025 (Online) 7th April Evening Shift
6

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
JEE Main 2025 (Online) 7th April Evening Shift
7

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
JEE Main 2025 (Online) 3rd April Morning Shift
8

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

JEE Main 2025 (Online) 3rd April Evening Shift
9

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
JEE Main 2025 (Online) 28th January Evening Shift

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