Compound $A$ is converted to $B$ on reaction with $C H C l_{3}$ and $K O H$ . The compound $B$ is toxic and can be decomposed by $C$ .
$A, B$ and $C$ respectively are

Secondary amine, nitrile compound, conc.

N a O H

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Primary amine, isonitrile compound, conc.

H C l

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Secondary amine, isonitrile compound, conc

N a O H

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Primary amine, nitrile compound, conc.

H C l

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Solution

The correct option is B Primary amine, isonitrile compound, conc. $H C l$
$C H C l_{3} / K O H$ is the reagent for carbylamine reaction. It is the reaction of a primary amine, chloroform and a base to synthesise isocyanides.
The carbylamine reaction cannot be used to synthesise isocyanides from secondary or tertiary amines.
Hence, 'A' is primary amine and 'B' is isonitrile.
Isonitrile is acid hydrolysed to give amine and acid.

Hence, option (c) is correct.

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