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The compound that will undergo $S_N1$ reaction with the fastest rate is
A
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B
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C
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D
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Detailed Solution
The compound forming the most stable carbocation undergoes $S_N1$ reaction at the fastest rate.
1-phenylethyl bromide ($C_6H_5-CH(CH_3)-Br$) ionises to give a benzylic carbocation that is stabilised by resonance with the benzene ring (and by the methyl group).
So it undergoes $S_N1$ reaction with the fastest rate.