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Predict the order of reactivity of the f...

Predict the order of reactivity of the following compounds in `S_N1` and `S_N2` reactions:
(i) The four isomeric bromobutanes,
(ii) `C_6H_5CHBr, C_6H_5(C_6H_5)Br, C_6H_5CH(CH_3)Br and C_6H_5C(CH_3)(C_6H_5)Br`.

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i) `CH_3CH_2CH_2CH_2Br < (CH_3)_2 CHCH_2Br < CH_3CH_2CH(Br)CH_3 < (CH_3)_3 CBr (S_N1)`
`CH_3CH_2CH(Br)CH_3 < (CH_3)_(2) CHCH_2Br > CH_3CH_2CH(Br)CH_3 < (CH_3)_(3) CBr (S_N2)`
ii) `C_6H_5C(CH_3)(C_6H_5)Br > C_6H_5CH(C_6H_5)Br > C_6H_5CH(CH_3)Br > C_6H_5CH_2Br (S_N1)`
`C_6H_5C(CH_3)(C_6H_5)Br < C_6H_5CH(C_6H_5)Br < C_6H_5CH(CH_3)Br < C_6H_5CH_2Br (S_N2)`
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