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COMEDK2022Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which among the following will not liberate nitrogen on reaction with nitrous acid?

Options

  1. Adimethylamine
  2. B2-aminopropane
  3. Cethylamine
  4. Dmethylamine

Correct answer

A. dimethylamine

Step-by-step solution

Nitrous acid ( HNO₂ ) reacts with primary aliphatic amines ( R-NH₂ ) to form unstable diazonium salts, which decompose to evolve nitrogen gas ( N₂ ) and form alcohols. Ethylamine ( CH₃CH₂NH₂ ), methylamine ( CH₃NH₂ ), and 2-aminopropane ( (CH₃)₂CHNH₂ ) are all primary aliphatic amines and will liberate nitrogen gas. Dimethylamine ( (CH₃)₂NH ) is a secondary aliphatic amine. Secondary amines react with nitrous acid to form N-nitrosamines, which are yellow oily compounds. The reaction is: (CH₃)₂NH + HNO₂ (CH₃)₂N-N=O

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