Question

Which of the following is Hinsberg reagent?

• A. Benzene sulphonic acid
• B. Benzene sulphonamide
• C. p-Toluene sulphonyl chloride
• D. None of these

Hint:

Remember: Hinsberg reagent = p-TsCl, used to differentiate types of amines.

Answer 1

The Correct Option is C

Step 1: Recall Hinsberg test.
The Hinsberg test distinguishes between primary, secondary, and tertiary amines. The reagent used is p-toluene sulphonyl chloride (TsCl).
Step 2: Explanation.
- Primary amines form soluble sulphonamides.
- Secondary amines form insoluble sulphonamides.
- Tertiary amines do not react.
Step 3: Conclusion.
Thus, Hinsberg reagent is p-toluene sulphonyl chloride.