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Isomerism · Question 12

JEE Main 2025 (Online) 3rd April Morning ShiftMCQMedium📈 Topic in 23% papers+4−1
1

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

Answer

(4) A & B Only

Solution

A. Pentan-3-one and pentan-2-one: both C5H10O, same functional group (ketone) but different alkyl groups on the two sides of C=O (C2H5/C2H5 and CH3/C3H7) metamers. Correct.

B. Butanenitrile (CH3CH2CH2-C N) and propyl isocyanide (CH3CH2CH2-N C): both C4H7N, different functional groups functional isomers. Correct.

C. Butan-1-ol ( C4H10O) and pentan-2-ol ( C5H12O) have different molecular formulae not isomers. Incorrect.

D. Butan-1-amine ( C4H11N, 1° amine) and N-ethylpropan-1-amine ( C5H13N, 2° amine) differ by CH2 but have different functional groups (-NH2 and >NH) not members of the same homologous series. Incorrect.

A and B only

Answer: (4)

JEE Main 2025 (Online) 3rd April Morning Shift

Keep practising — Isomerism

2

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
3

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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