Question

The structures of major products A , B and C in the following reaction are sequence

• A.
• B.
• C.
• D.

Hint:

Pay attention to the reagents and reaction conditions to identify the type of reaction occurring in each step. \(LiAlH_{4}\) is a strong reducing agent, commonly used to reduce nitriles to amines.

Answer 1

The Correct Option is C

To determine the structures of the major products A, B, and C in the given reaction sequence, we need to analyze each step:

1. Formation of Compound A:
   • The starting compound is an aldehyde.
   • The first reaction is the addition of \(\text{NaHSO}_3\) and dilute HCl, followed by the addition of \(\text{NaCN, H}_2\text{O}\).
   • This sequence of reagents typically results in the conversion of an aldehyde to a cyanohydrin.
2. Formation of Compound B:
   • Compound A, which is presumed to be a cyanohydrin, is then treated with \(\text{LiAlH}_4\).
   • \(\text{LiAlH}_4\) is a strong reducing agent that can reduce nitriles to primary amines.
   • Therefore, compound B is likely a primary amine formed from the cyanohydrin in compound A.
3. Formation of Compound C:
   • Compound A is also treated separately with \(\text{HCl/H}_2\text{O}\) and then heated (denoted by \(\Delta\)).
   • This step indicates the hydrolysis of the nitrile group present in the cyanohydrin to a carboxylic acid under acidic conditions.
   • Thus, compound C is a carboxylic acid.

Based on the analysis of the reaction steps, the structures of A, B, and C, can be concluded as follows:

This matches the correct option provided in the question, confirming the sequence of transformations as proposed.