The order of reactivity of the following compounds towards electrophilic substitution will be :
(I) `C_(6)H_(5)CH_(3)`
(II) `C_(6)H_(5)CH_(2)CH_(3)`
(III) `(C_(6)H_(5)CH(CH_(3))_(3)`
(IV) `(C_(6)H_(5)C(CH_(3))_(3)`

The order of reactivity of the following compounds C_(6)H_(5)CH_(3) C_(6)H_(5)CH_(2)CH_(3) towards electrophilic substritution will be :

The decreasing order of reactivity of the following compounds in S_(N)1 reactions is _________. (i) C_(6)H_(5)CH_(2)Br" " (ii) C_(6)H_(5)CH(C_(6)H_(5)Br (iii) C_(6)H_(5)CH(CH_(3)Br" "(iv) C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br

Predict the order of reactivity of the following compounds in S_(N)1 and S_(N)2 reactions : (a) The four isomeric bromobutanes (b) C_(6)H_(5)CH_(2)Br, C_(6)H_(5)CH(C_(6)H_(5))Br, C_(6)H_(5)CH(CH_(3))Br, C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br

C_(6)H_(5)-CH=CH-CO-CH_(3)

Predict the order of reactivity of the following compounds in S _(N)1 and S_(N)2 reactions: (i) The four isomeric bromobutanes (ii) C_(6)H_(5)CH_(2)Br, C_(6)H_(5)CH(C_(6)H_(5))Br, C_(6)H_(5)CH(CH_(3))Br, C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br