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JEE Main · 2025 · 03 Apr 2025 · Shift 1 · General Organic Chemistry

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Identify the correct statements from the following
A. (see structures) are metamers
B. (see structures) are functional isomers
C. (see structures) are position isomers
D. (see structures) are homologous
Choose the correct answer from the options given below
Structure A-1
A-1
Structure A-2
A-2
Structure B-1
B-1
Structure B-2
B-2
Structure C-1
C-1
Structure C-2
C-2
Structure D-1
D-1
Structure D-2
D-2
  1. (A)C & D only
  2. (B)B & C only
  3. (C)A & B only✓ Correct
  4. (D)A, B & C only

Answer: (C)

Solution

Pentan-3-one and pentan-2-one share the formula and the ketone group but carry different alkyl groups about the carbonyl, so they are metamers and statement A holds. A nitrile and the isocyanide of the same formula differ in functional group, making them functional isomers, so statement B holds. Butan-1-ol and pentan-2-ol have different molecular formulas and so cannot be position isomers, which makes statement C false. A primary amine and a secondary amine belong to different classes rather than one homologous series, so statement D is false. Only statements A and B are correct.

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Single correct option

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