Reaction of nitrous acid with aliphatic primary amine in cold gives.

A diazonium salt An alcohol A nitrite A dye

An alcohol

The correct answer is option 2. An alcohol. The reaction of aliphatic primary amines with nitrous acid gives diazonium salts which decompose to form a mixture of compounds containing alkyl chlorides, alkenes and alcohols. Usually, alcohols are the major products. The reactions are shown below: