Question

Which of the following reaction/s does not yield an amine?

• A. R - X + NH₃ $\xrightarrow{\text{alc}}$
• B.
• C.
• D.

Hint:

When hydrolyzing a nitrile (R-C≡N) with acidic water, it leads to a carboxylic acid instead of an amine.

Answer 1

The Correct Option is B

- Reaction I: This is an alkylation reaction of an alkyl halide (R-X) with ammonia (NH₃). It yields a primary amine (R-NH₂) by substitution. - Reaction II: This reaction involves the reduction of a nitrile (R-C≡N) to a primary amine (R-CH₂NH₂) under catalytic hydrogenation conditions (H₂/Ni). - Reaction III: In this case, a nitrile (R-C≡N) is hydrolyzed with acidic water (H₂O + H⁺), which leads to the formation of a carboxylic acid (R-COOH), not an amine. - Reaction IV: Here, a primary amide (R-C-NH₂) undergoes reduction with LiAlH₄ to form an amine (R-CH₂NH₂). Thus, reaction III does not yield an amine, as it produces a carboxylic acid instead. Therefore, the correct answer is Option 2 (Only III).