Question

The product formed from the following reaction sequence is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This sequence involves reduction of a nitrile, followed by diazotization of an aliphatic amine and subsequent hydrolysis.
Detailed Explanation:
1. Reduction: \(C_{6}H_{5}CN\) (benzonitrile) is reduced by \(LiAlH_{4}\) to form \(C_{6}H_{5}CH_{2}NH_{2}\) (benzylamine).
2. Diazotization: Benzylamine reacts with \(NaNO_{2} + HCl\) at low temperatures to form the benzyl diazonium salt, \(C_{6}H_{5}CH_{2}N_{2}^{+}Cl^{-}\).
3. Hydrolysis: Aliphatic diazonium salts (and benzyl ones) are highly unstable and react immediately with water (\(H_{2}O\)) even at low temperatures to evolve \(N_{2}\) gas and form an alcohol.
Reaction: \(C_{6}H_{5}CH_{2}N_{2}^{+}Cl^{-} + H_{2}O \rightarrow C_{6}H_{5}CH_{2}OH + N_{2} + HCl\)
The final product is Benzyl alcohol.
Step 2: Final Answer:
The product is Benzyl alcohol. Option (4) is correct.