Which amongst the following reaction of… - NEET UG 2023 Chemistry PYQ

NEET UG 2023 — Chemistry Organic Chemistry

2023mcqmedium

Which amongst the following reaction of alkyl halides produces isonitrile as a major products? (A) $\mathrm{R}-\mathrm{X}+\mathrm{HCN} \rightarrow$ (B) $\mathrm{R}-\mathrm{X}+\mathrm{AgCN} \rightarrow$ (C) $\mathrm{R}-\mathrm{X}+\mathrm{KCN} \rightarrow$ (D) $\mathrm{R}-\mathrm{X}+\mathrm{NaCN} \underset{\mathrm{H}_2 \mathrm{O}}{\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}}$ Choose the most appropriate answer from the options given below

Official previous-year question

Held on 30 Apr 2023 · Verified 9 Jul 2026.

Options

A
(B) only
B
(A) and (B) only
C
(D) only
D
(C) and (D) only

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Solution

$\mathrm{KCN}$ is predominately ionic and provides cyanide ions in solution. Although both carbon and introgen atoms are in a position to donate electron pairs, the attack takes place mainly through carbon atom and not through nitrogen atom since $\mathrm{C}-\mathrm{C}$ bond is more stable than $\mathrm{C}-\mathrm{N}$ bond. However, AgCN is mainly covalent in nature and nitrogen is free to donate electron pair forming isocyanide as the major product $\mathrm{R}-\mathrm{X}+\mathrm{AgCN} \longrightarrow \mathrm{R}-\mathrm{NC}+\mathrm{AgX}$

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