MHT CET 2022 Chemistry question

Which among the following reactions represents carbylamine reaction?

(A)\mathrm{R{-}NH_2 + CHCl_3 + 3KOH \xrightarrow[alc]{\Delta} R{-}NC + 3KCl + 3H_2O}Correct
(B)\mathrm{R{-}NH_2 + HNO_2 \xrightarrow[ii) H_2O]{i) NaNO_2 + HCl} R{-}OH + N_2\uparrow + HCl}
(C)\mathrm{R{-}NH_2 + CH_3COCl \xrightarrow{pyridine} R{-}NH{-}COCH_3 + HCl}
(D)

Answer: (A)

Solution

The carbylamine (isocyanide) reaction is the test for primary amines: an aliphatic or aromatic primary amine is heated with chloroform and alcoholic KOH to give a foul-smelling isocyanide (carbylamine), \mathrm{R{-}NH_2 + CHCl_3 + 3KOH \xrightarrow{\Delta} R{-}NC + 3KCl + 3H_2O}. This is

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Question ID VK-097110