Compound $\mathrm{A}$ is converted to $\mathrm{B}$ on reaction with ${\mathrm{CHCl}}_3$ and $\mathrm{KOH}$. The compound $\mathrm{B}$ is toxic and can be decomposed by $\mathrm{C}. \mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ respectively are:

• A

  primary amine, nitrile compound, conc. $\mathrm{HCl}$
• B

  secondary amine, isonitrile compound, conc. $\mathrm{NaOH}$
• Correct answer
  C

  primary amine, isonitrile compound, conc. $\mathrm{HCl}$
• D

  secondary amine, nitrile compound, conc. $\mathrm{NaOH}$

Hence, the correct answer is option: 'C'.