Question:
Write a simple chemical test to distinguish between methylamine and aniline.
Write a simple chemical test to distinguish between methylamine and aniline.
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- Aniline undergoes diazotization and forms a coloured dye.
- Methylamine does not form a diazonium salt.
Updated On: Feb 25, 2025
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Solution and Explanation
Step 1: Diazotization of Aniline
- Aniline reacts with nitrous acid (\( HNO_2 \)) at low temperature (0–5°C) to form benzene diazonium chloride.
\[
\text{C}_6\text{H}_5\text{NH}_2 + HNO_2 \rightarrow \text{C}_6\text{H}_5\text{N}_2^+Cl^-
\]
Step 2: Coupling Reaction with Phenol
- The diazonium salt reacts with phenol to form an orange dye.
- Methylamine (\( CH_3NH_2 \)) does not undergo diazotization and does not form the orange dye.
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