How can a mixture of $$1^\circ, 2^\circ, ext{and } 3^\circ$$ amines be separated chemically?

Question

How can a mixture of  $$1^\circ, 2^\circ, 	ext{and } 3^\circ$$  amines be separated chemically?

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Using the Hinsberg Method.    1. React mixture with $$PhSO_2Cl$$  .    2. Acidify:  $$1^\circ$$  derivative precipitates (was soluble in base).    3. Filter: $$2^\circ$$  derivative is solid (insoluble in base/acid).    4. Filtrate: Contains $$3^\circ$$   amine (didn't react, soluble in acid).

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