Butanenitrile may be prepared by heating :

propyl alcohol with KCN

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butyl alcohol with KCN

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butyl chloride with KCN

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propyl chloride with KCN

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Solution

The correct option is B propyl chloride with KCN
$C H_{3} - C H_{2} - C H_{2} - C l + K C N ⟶ C H_{3} - C H_{2} - C H_{2} - C N + K C l$

$C l^{-}$ is better leaving group than $O H^{-}$

Option D is correct.

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