Test one functional group in the given unknown organic compound L

1.	Test one functional group in the given unknown organic compound L
Answer» Reactions of amides: Reaction of NaOH: Amides are decomposed by NaOH to evolve ammonia. The gas can be tested by a moist red litmus paper which is then turned blue. Alkaline hydrolysis of aromatic amides to aromatic acid: The soluble sodium salt of aromatic acid formed from aromatic amides upon hydrolysis is regenerated as white precipitate in acidic medium. Biuret Reaction for aliphatic diamide: When aliphatic diamide is heated at a temperature above its melting point, ammonia is evolved and crystalline biuret is formed. This biuret in alkaline medium gives a violet colour with a drop of copper sulphate solution.

Answer»

Reactions of amides:

Reaction of NaOH:

Amides are decomposed by NaOH to evolve ammonia. The gas can be tested by a moist red litmus paper which is then turned blue.

Alkaline hydrolysis of aromatic amides to aromatic acid:

The soluble sodium salt of aromatic acid formed from aromatic amides upon hydrolysis is regenerated as white precipitate in acidic medium.

Biuret Reaction for aliphatic diamide:

When aliphatic diamide is heated at a temperature above its melting point, ammonia is evolved and crystalline biuret is formed. This biuret in alkaline medium gives a violet colour with a drop of copper sulphate solution.

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