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Predict the order of reactivity of the f...

Predict the order of reactivity of the following compounds in `S_N^1 and S_N^2` reactions:
`C_6H_5CH_2Br. C_6H_5CH (C_6H_5)Br`,
`C_6H_5CH. (CH_3)Br, C_6H_5C. (CH_3).(C_6H_5) Br`.

Text Solution

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`S_(N^1) " reaction" : CH_3CH_2CH_2 CH_2 Br lt (CH_3)_2 CH.CH_2 Br lt CH_3CH_2 CH (Br) CH_3 lt (CH_3)_3 CBr`
`S_(N^2)" reaction" : CH_3 CH_2 CH_2 CH_2 Br gt (CH_3)_2 CH.CH_2 Br gt CH_3CH_2 CH(Br)CH_3 gt (CH_3)_3C.Br`.
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