JEE Main Chemistry question

In which case is the formation of butanenitrile possible? [OJEE 2004]

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

Butanenitrile, CH_3CH_2CH_2-CN, has 4 carbons in total, one of which comes from the group itself. It must therefore be formed from a 3-carbon alkyl halide (propyl bromide) reacting with KCN by nucleophilic substitution: $CH_3CH_2CH_2Br + KCN

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Question ID VK-150212