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Compound A is converted to B on reaction with CHCl3 and KOH. The compound B is toxic and can be decomposed by C. A, B and C respectively are:

1. primary amine, nitrile compound, conc. HCl
2. secondary amine, isonitrile compound, conc. NaOH
3. primary amine, isonitrile compound, conc. HCl
4. secondary amine, nitrile compound, conc. NaOH

Correct answer: primary amine, isonitrile compound, conc. HCl

Solution

A primary amine (A) reacts with CHCl3 + KOH (carbylamine reaction) to give a foul-smelling, toxic isonitrile (B). Isonitriles are hydrolysed/decomposed by conc. HCl (C) back to the amine and formic acid. So A = primary amine, B = isonitrile, C = conc. HCl.

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