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Hinsberg reagent is:

1. SO2Cl2
2. (COCl)2
3. C6H5COCl
4. C6H5SO2Cl

Correct answer: C6H5SO2Cl

Solution

Hinsberg reagent, known as benzenesulfonyl chloride, is used to differentiate between primary, secondary, and tertiary amines based on their reactivity with the reagent, making option D the correct choice.

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