$S_{N} 1$ & $S_{N} 2$ is not favourable in:

H_{2} C = C H - C l

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P h - C h_{2} - C l

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P h - C l

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H_{2} C = C H - C H_{2} - C l

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Solution

The correct options are
A $H_{2} C = C H - C l$
B $P h - C l$
$S_{N} 1$ and $S_{N} 2$ reaction mechanism is not favorable in $H_{2} C = C H - C l$ and $P h - C l$ .
In $H_{2} C = C H - C l$ , due to presence of carbon carbon double bond, addition reaction is favored over substitution reaction.
In $P h - C l$ due to the presence of benzene ring, nucleophilic substitution reaction requires drastic conditions.

Suggest Corrections

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