Which of the following compounds will react with ethanolic KCN
a.chlorobenzene b.allyl bromide c.vinyl bromide d. ethyl bromide

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Solution

The given reaction is a nucleophilic substitution reaction.
With ethanolic KCN, allyl bromide and ethyl bromide reacts to form nitrile compound. Chlorobenzene and vinyl bromide does not react as they have = bond and the bond is shorter and stronger cann't be replaced by CN group.
$C_{2} H_{5} B r + a l c K C N \to C_{2} H_{5} C N + K B r E t h y l b r o m i d e E t h y l c y a n i d e C H_{2} (B r) - C H = C H_{2} + a l c K C N \to C H_{2} (C N) - C H = C H_{2} + K B r A l l y l b r o m i d e A l l y l c y a n i d e$

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