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Karnataka Board PUCPUC Science 2nd PUC Class 12

Chemical Reactions of Amines - Carbylamine Reaction

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: Carbylamine Reaction

Only 1° amines (aliphatic and aromatic) react with CHCl₃ and alc. KOH to give isocyanides (carbylamines) with very bad smell.

  • Used as a test for 1° amines (Carbylamine test / Isocyanide test).
  • 2° and 3° amines do NOT give this reaction.

\[ \underset{1^\circ \text{ amine}}{\mathrm{RNH}_2} + \mathrm{CHCl}_3 + \text{Alc. } 3\mathrm{KOH} \longrightarrow \underset{\text{Alkyl isocyanide}}{\mathrm{RNC}} + 3\mathrm{KCl} + 3\mathrm{H}_2\mathrm{O} \]

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