nitrous acid test

Question

Aliphatic primary amine with nitrous acid gives:

RankGuru · Accepted Answer

The reaction with **Nitrous Acid ($HNO_2$)** is used to distinguish between classes of amines:
1. **Aliphatic $1^circ$ Amines**: React to form an extremely unstable diazonium salt that decomposes even at $0^\circ C$.
$R-NH_2 + HNO_2 	o [R-N_2^+Cl^-] \xrightarrow{H_2O} R-OH + N_2 \uparrow + HCl$
- Observation: Rapid **effervescence of Nitrogen gas** and formation of an alcohol.
2. **Aromatic $1^circ$ Amines**: Form stable diazonium salts at $0-5^\circ C$ with NO gas evolution.
3. **Secondary Amines**: Form yellow oily **N-nitrosoamines**.

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More nitrous acid test Practice Questions

Primary aliphatic amine treated with nitrous acid evolves: