Question: 85: The product formed from the following reaction sequence is
Answer: Option (2)
Explanation:
Benzonitrile on reduction with \mathrm{LiAlH}_{4} followed by hydrolysis gets converted into a primary amine, benzylamine.
\mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CN} \xrightarrow[\mathrm{H}_{2}\mathrm{O}]{\mathrm{LiAlH}_{4}} \mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CH}_{2}\mathrm{NH}_{2}In the next step, benzylamine reacts with nitrous acid formed in situ from
\mathrm{NaNO}_{2} + \mathrm{HCl}.
Aliphatic primary amines react with nitrous acid to form unstable diazonium salts,
which immediately decompose to give alcohols.
\mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CH}_{2}\mathrm{NH}_{2} \xrightarrow{\mathrm{NaNO}_{2}/\mathrm{HCl}} \mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CH}_{2}\mathrm{OH} + \mathrm{N}_{2}Thus, the final product obtained after hydrolysis is benzyl alcohol.
Hence, the correct answer is Option (2).