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Which of the compounds will react faster...

Which of the compounds will react faster in `S_(N)1` reaction with the `""^(-)OH` ion ?
`CH_(3)-CH_(2)-Cl` OR `C_(6)H_(5)-CH_(2)-Cl`

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Verified by Experts

The correct Answer is:
A
Because of resonanse effect in `CH_(2)=CH-overset(o+)(C )H_(2)CH_(2)=CH-CH_(2)Cl` will react faster through `S_(N)1` mechanism.
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