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Question

Which Of The Following Compound Does Not Liberate Nitrogen Gas On Treatment With Nitrous Acid?


  1. Carbamide

  2. Alkanamide

  3. Primary amines

  4. Secondary amines

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Solution

The correct option is D

Secondary amines


Explanation for the correct option:

(D) Secondary amines

  • Secondary amines do not react with Nitrous Acid (HNO2) to liberate Nitrogen gas.
  • Only primary amines react with Nitrous acid to liberate Nitrogen gas.
  • The chemical reaction can be depicted as:

R2NH+H-O-N=O(l)R2N=O+H2O(l)

Explanation for incorrect options:

(A) Carbamide

  • Carbamide which is also known as urea is a primary amine that reacts with Nitrous acid to liberate Nitrogen gas.
  • The chemical reaction can be depicted as:

(B) Alkanamide

  • Alkanamide is a primary amine that reacts with Nitrous acid to liberate Nitrogen gas.
  • For example, Methamide reacts with Nitrous acid to produce Nitrogen gas.
  • The chemical reaction can be depicted as:

(C) Primary amines

  • Primary amines react with Nitrous acid to liberate Nitrogen gas.
  • The chemical reaction can be depicted as:

Hence, the correct option is D i.e. Secondary amines.


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