Question:
Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is:
Amines: Aniline, N-Methylaniline, Methanamine, N,N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N,N-Dimethylaniline, Allyl amine, Isopropyl amine
Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is:
Amines: Aniline, N-Methylaniline, Methanamine, N,N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N,N-Dimethylaniline, Allyl amine, Isopropyl amine
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In Hinsberg’s test:
- Primary amines → soluble sulphonamides.
- Secondary amines → insoluble sulphonamides.
- Tertiary amines → no reaction.
Updated On: Feb 24, 2026
- 4
- 3
- 5
- 8
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The Correct Option is C
Solution and Explanation
Concept:
Hinsberg’s test distinguishes primary, secondary, and tertiary amines based on solubility of sulphonamide derivatives in alkali.
Primary amines form sulphonamides soluble in alkali.
Secondary amines form sulphonamides insoluble in alkali.
Tertiary amines do not react with Hinsberg’s reagent.
Step 1: Identify secondary amines. - N-Methylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-propylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-phenylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-Methyl methanamine (secondary aliphatic amine) → insoluble sulphonamide. - Isopropyl amine is primary, so soluble. - N,N-Dimethylmethanamine and N,N-Dimethylaniline are tertiary, no sulphonamide.
Step 2: Count. Thus, 5 secondary amines give alkali insoluble sulphonamides. \[ \text{Answer: } 5 \]
Primary amines form sulphonamides soluble in alkali.
Secondary amines form sulphonamides insoluble in alkali.
Tertiary amines do not react with Hinsberg’s reagent.
Step 1: Identify secondary amines. - N-Methylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-propylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-phenylaniline (secondary aromatic amine) → insoluble sulphonamide. - N-Methyl methanamine (secondary aliphatic amine) → insoluble sulphonamide. - Isopropyl amine is primary, so soluble. - N,N-Dimethylmethanamine and N,N-Dimethylaniline are tertiary, no sulphonamide.
Step 2: Count. Thus, 5 secondary amines give alkali insoluble sulphonamides. \[ \text{Answer: } 5 \]
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