Identify the product when ethyl amine reacts with nitrous acid in...

Ethyl amine ($\text{CH}_3\text{CH}_2\text{NH}_2$) is a primary aliphatic amine.

When a primary aliphatic amine reacts with nitrous acid ($\text{HNO}_2$) in cold conditions, it forms an unstable alkyl diazonium salt.

This diazonium salt readily decomposes to release nitrogen gas and forms a carbocation, which reacts with water present in the mixture to give ethyl alcohol ($\text{CH}_3\text{CH}_2\text{OH}$).

$\text{CH}_3\text{CH}_2\text{NH}_2 + \text{HNO}_2 \rightarrow [\text{CH}_3\text{CH}_2\text{N}_2^{+}\text{Cl}^{-}] \rightarrow \text{CH}_3\text{CH}_2\text{OH} + \text{N}_2 \uparrow + \text{HCl}$

Answer: $\text{CH}_3\text{CH}_2\text{OH}$