JEE Main Chemistry question

Which reagent is useful in increasing the carbon chain of an alkyl halide?

(A)HCN
(B)KCNCorrect
(C)
(D)AgCN

Answer: (B)

Solution

Treating an alkyl halide with (ionic, carbon-attacking) KCN substitutes the halide by , adding one carbon to the chain; subsequent hydrolysis or reduction of this nitrile gives a carboxylic acid or amine with one more carbon than the starting halide: $RX + KCN → RCN +

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Question ID VK-148210