Question

The chemical test which can be used to distinguish between ethanamine and aniline is:

• A. Haloform test
• B. Tollen’s test
• C. Azo dye test
• D. Hinsberg test

Hint:

Use azo dye test to distinguish aromatic primary amines (like aniline) from aliphatic ones (like ethanamine). Only aromatic amines form stable diazonium salts.

Answer 1

The Correct Option is C

- Ethanamine is an aliphatic primary amine. - Aniline is an aromatic primary amine. **Azo dye test** is a specific test used to detect aromatic primary amines. In this test: - Aniline reacts with nitrous acid (generated in situ from NaNO\(_2\) + HCl) to form a diazonium salt. - This diazonium salt couples with phenol or β-naphthol to form a bright-colored azo dye. Ethanamine (an aliphatic amine) does not form a stable diazonium salt and hence does **not** give this test. \[ \boxed{\text{Aniline gives azo dye test, ethanamine does not.}} \]