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Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is _ _ _ _ . Aniline, N-Methylaniline, Methanamine, N, N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N, N-Dimethylaniline, Allyl amine, Isopropyl amine

Options

  1. A2
  2. B5
  3. C4
  4. D8

Correct answer

C. 4

Step-by-step solution

Hinsberg's reagent (benzenesulfonyl chloride) classifies amines by their reaction products: Primary amines (RNH₂) form alkali-soluble sulfonamides (soluble in NaOH). Secondary amines (R₂NH) form alkali-insoluble sulfonamides (precipitate in NaOH). Tertiary amines (R₃N) do not react. Analyzing the given amines: Aniline (primary), Methanamine (primary), Phenylmethanamine (primary), Allyl amine (primary), Isopropyl amine (primary) → alkali-soluble. N,N-Dimethylmethanamine (tertiary), N,N-Dimethylaniline (tertiary) → n

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