Which one of the following forms propanenitrile as the major product?

Which one of the following forms propanenitrile as the major product?
  1. Propyl bromide + alcoholic KCN
  2. Ethyl bromide + alcoholic KCN
  3. Ethyl bromide + alcoholic AgCN
  4. Propyl bromide + alcoholic AgCN

Solution

$\begin{array}{ll}\mathrm{C}_2 \mathrm{H}_5 \mathrm{Br}+\mathrm{KCN}_{\text {(alco.) }} \stackrel{\Delta}{\longrightarrow} & \\ \text { Ethyl bromide } & \mathrm{C}_2 \mathrm{H}_5 \mathrm{CN}+\mathrm{KBr} \\ & \begin{array}{l}\text { Propanenitrile } \\ \text { (Major product) }\end{array}\end{array}$

Asked in: NEET 2012 (Mains)

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