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Question

Which of the following tests can distinguish primary, secondary and tertiary amines?
  1. Azo-dye test
  2. Hinsberg reagent
  3. Carbylamine test
  4. Acetyl chloride

A
Carbylamine test
B
Azo-dye test
C
Hinsberg reagent
D
Acetyl chloride
Solution
Verified by Toppr

Treatment of an amine with benzenesulfonyl chloride in aqueous sodium hydroxide is useful for determining whether an unknown amine is primary, secondary or tertiary.

Primary amines - dissolves in base and precipitates from acid is a positive test.

Secondary amines - precipitates from base and no change from acid is a positive test.

Tertiary amines - precipitates from base and dissolves in acid is a positive test.

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