Question:

Compound A is converted to B on reaction with \(\mathrm{CHCl_3}\) and KOH. The compound B is toxic and can be decomposed by C. A, B and C respectively are :

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\(\mathrm{CHCl_3}\) + KOH with a primary amine is the carbylamine reaction, giving a foul-smelling toxic isocyanide, which is hydrolysed by acid.
Updated On: Nov 4, 2026
  • primary amine, nitrile compound, conc. HCl
  • secondary amine, isonitrile compound, conc. NaOH
  • primary amine, isonitrile compound, conc. HCl
  • secondary amine, nitrile compound, conc. NaOH
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The Correct Option is C

Solution and Explanation

\(\mathrm{R-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3KCl + 3H_2O}\) (carbylamine / isocyanide test). Only primary amines (aliphatic or aromatic) respond, so A is a primary amine and B is an isonitrile (isocyanide).
Isocyanides are toxic and are hydrolysed by mineral acid (conc. HCl) to the primary amine and formic acid, while they are stable to alkali. So C is conc. HCl.
A = primary amine, B = isonitrile compound, C = conc. HCl.
Answer: (3) primary amine, isonitrile compound, conc. HCl
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