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What is Hinsberg's reagent and where Hinsberg's test use?

Hinsberg's reagent is benzene sulphonyl chloride and it use for distinguished between 1°, 2° and 3° amine .
Primary amines contains two active Hydrogen so easy react with benzene sulphonyl chloride and form a salt, which is dissolved in NaOH due to remain another active Hydrogen. Secondary amines have  only one hydrogen so it react with Benzene sulphonyl chloride but does not dissolve d in NaOH. Tertiary amines have no active Hydrogen so does not react with Benzene sulphonyl chloride.

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