Question:
Which one of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?
Which one of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?
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Which one of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?
Updated On: Apr 15, 2026
- $CH_{3}NH_{2}$
- $(CH_{3})_{3}N$
- $(C_{2}H_{5})_{2}NH$
- $C_{6}H_{5}NHC_{6}H_{5}$
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Primary amines react with Hinsberg reagent (benzene sulphonyl chloride) to form a sulphonamide containing an acidic hydrogen.
Step 2: Analysis
$CH_{3}NH_{2}$ is a primary ($1^{\circ}$) amine. It reacts to form N-methyl benzene sulphonamide.
Step 3: Solubility
The resulting sulphonamide has a hydrogen atom attached to Nitrogen, making it acidic and thus soluble in alkali (NaOH).
Step 4: Comparison
Secondary amines form sulphonamides without acidic hydrogen (insoluble in alkali), and tertiary amines do not react.
Final Answer: (A)
Primary amines react with Hinsberg reagent (benzene sulphonyl chloride) to form a sulphonamide containing an acidic hydrogen.
Step 2: Analysis
$CH_{3}NH_{2}$ is a primary ($1^{\circ}$) amine. It reacts to form N-methyl benzene sulphonamide.
Step 3: Solubility
The resulting sulphonamide has a hydrogen atom attached to Nitrogen, making it acidic and thus soluble in alkali (NaOH).
Step 4: Comparison
Secondary amines form sulphonamides without acidic hydrogen (insoluble in alkali), and tertiary amines do not react.
Final Answer: (A)
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