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Question: Which among the following amines does NOT react with benzenesulphonyl chloride?...

Which among the following amines does NOT react with benzenesulphonyl chloride?

A

CH3-CH2-NH2

B

(CH3)3-N

C

(CH3)2 - NH

D

CH3-NH-C2H5

Answer

(CH₃)₃N

Explanation

Solution

Benzenesulphonyl chloride reacts with amines that have an available N–H bond (primary and secondary amines) to form sulphonamides. However, tertiary amines lack this N–H bond and are sterically hindered, so they do not react.

  • (A) CH₃CH₂NH₂: Primary amine – reacts.
  • (B) (CH₃)₃N: Tertiary amine – does not react.
  • (C) (CH₃)₂NH: Secondary amine – reacts.
  • (D) CH₃NH–C₂H₅: Secondary amine – reacts.