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COMEDK2023Evening ShiftChemistryAminesActual

Which one of the following will give a positive result when it is warmed with Chloroform and alcoholic solution of KOH ?

Options

  1. Ap-Methylbenzylamine
  2. BN - Methyl-o-Methylaniline
  3. CN-Methyl-p-Methylaniline
  4. DN,N-Dimethylaniline.

Correct answer

A. p-Methylbenzylamine

Step-by-step solution

The carbylamine reaction is a characteristic test for primary amines. When a primary amine is heated with chloroform ( CHCl₃ ) and an alcoholic solution of potassium hydroxide ( KOH ), an isocyanide (carbylamine) is formed, which is characterized by an extremely foul smell. The reaction is represented as: R-NH₂ + CHCl₃ + 3KOH R-NC + 3KCl + 3H₂O . Analyzing the given options: (1) p-Methylbenzylamine is a primary amine ( CH₃-C₆H₄-CH₂-NH₂ ), so it will undergo the carbylamine reaction. (2) N-Methyl-o-Methylaniline is

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