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A mixture of primary (1 degree), secondary (2 degree), and tertiary (3 degree) amines can be separated by which of the following methods?

1. Hinsberg's method
2. Hofmann's isocyanide (carbylamine) test
3. Fractional distillation
4. Reaction with NaNO2 and HCl

Correct answer: Hinsberg's method

Solution

Hinsberg's method uses benzenesulfonyl chloride (C6H5SO2Cl) to distinguish and separate 1 degree, 2 degree, and 3 degree amines based on the solubility of the resulting sulfonamides in NaOH. This is the standard separation method for mixed amines.

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