NEET 2022 Chemistry Reactions of Primary Amines MCQ Question

Chapter: Amines

Class: 12 | Topic: Reactions of Primary Amines | Difficulty: 🟡 Medium

✅ Ans: B — Benzyl alcohol $(C_6H_5CH_2OH)$

$$C_6H_5CN \xrightarrow{LiAlH_4/H_2O} C_6H_5CH_2NH_2$$

Nitrile is reduced to a primary amine.

Then:

$$C_6H_5CH_2NH_2 \xrightarrow{NaNO_2+HCl} C_6H_5CH_2N_2^+ \xrightarrow{H_2O} C_6H_5CH_2OH$$

So the final product is benzyl alcohol → Option B.

📌 NCERT: Primary aliphatic amines react with nitrous acid to form alcohols with liberation of $N_2$.

🧠 NEET Trick:

$$\boxed{R-CN \xrightarrow{LiAlH_4} R-CH_2NH_2 \xrightarrow{HNO_2} R-CH_2OH}$$

Difficulty: 🟡 Medium — requires recognizing two consecutive reactions.