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(B) The reaction described is the Carbylamine reaction,which is a characteristic test for primary amines.$R-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3K

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primary amine,isonitrile compound,conc. $HCl$

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(B) The reaction described is the Carbylamine reaction,which is a characteristic test for primary amines.$R-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3KCl + 3H_2O$Here,$A$ is a primary amine $(R-NH_2)$,and $B$ is an isonitrile $(R-NC)$,which is toxic.Isonitriles can be decomposed (hydrolyzed) by treatment with concentrated mineral acids like $HCl$ to yield the original amine and formic acid:$R-NC + 2H_2O \xrightarrow{HCl} R-NH_2 + HCOOH$Thus,$A$ is a primary amine,$B$ is an isonitrile compound,and $C$ is conc. $HCl$.

Compound $A$ is converted to $B$ on reaction with $CHCl_3$ and $KOH$. The compound $B$ is toxic and can be decomposed by $C$. $A, B$ and $C$ respectively are:

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