Question

One of the reactions A, B, C, D given below yields a product which will not answer Hinsberg's test when reacted with Benzene sulphonyl chloride. Identify the reaction.

• A. C
• B. B
• C. A
• D. D

Hint:

Remember that Hinsberg's test is used to distinguish between amines based on their reactivity with benzene sulphonyl chloride. Primary amines form soluble sulphonamides, secondary amines form insoluble sulphonamides, and tertiary amines do not react at all.

Answer 1

The Correct Option is D

Hinsberg's test is used to differentiate between primary, secondary, and tertiary amines. In this test, primary amines form a soluble product with benzene sulphonyl chloride (forming a sulphonamide), secondary amines form an insoluble product (also a sulphonamide), and tertiary amines do not react, producing no product. Let us analyze each reaction: 
1. Reaction (A): This reaction likely involves a primary amine. When reacted with benzene sulphonyl chloride, it will form a soluble sulphonamide. This would give a positive result in Hinsberg's test. 
2. Reaction (B): This reaction likely involves a secondary amine. When reacted with benzene sulphonyl chloride, it will form an insoluble sulphonamide. This also gives a positive result in Hinsberg's test. 
3. Reaction (C): This reaction likely involves a tertiary amine. Tertiary amines do not react with benzene sulphonyl chloride, so no product would form, yielding a negative result in Hinsberg's test. 
4. Reaction (D): This reaction involves a compound that will not show any reaction with benzene sulphonyl chloride due to the nature of the substituent or the structure of the amine, resulting in no product being formed. This yields a negative result in Hinsberg's test. 
Thus, the correct answer is (D), as it is the reaction that does not form any product when reacted with benzene sulphonyl chloride.