Question

compare the reactivity of chloroEthene and 1 chloroprop 2 ene with KCN​

Answer 1

KCN with Haloalkanes gives nucleophilic substitution reaction. For quick reaction the carbocation formed as an intermediate should be stable and in this case carbocation of chloroethene is more stable than that of 1-chloroprop-2-ene.

The positive charge on ethnyl group would involve in resonance but this can't occur in propnyl, hence the ethnyl carbocation is more stable.

Thus Chloroethene is more reactive than 1-chloroprop-2-ene towards KCN

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