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The Hinsberg reagent is:

1. C6H5SO2Cl
2. C6H5N2+ Cl-
3. phthalimide potassium salt
4. HO-C6H4-N=N-C6H5

Correct answer: C6H5SO2Cl

Solution

Hinsberg's reagent, used to distinguish primary, secondary, and tertiary amines, is benzenesulfonyl chloride, C6H5SO2Cl. The other options (diazonium salt, phthalimide salt, an azo dye) are not Hinsberg's reagent.

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