Condiser the reactions,
(i) `(CH_(3))_(2)CH-CH_(2)Broverset(C_(2)H_(5)OH)rarr(CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+HBr`
(ii) `(CH_(3))_(2)CH-CH_(2)Broverset(C_(2)H_(5)O^(-))rarr(CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+Br^(-)`
The mechanism of reactions (i) and (ii) are respectively :

Options

A. `S_N1` and `S_N2`
B. `S_N1` and `S_N1`
C. `S_N2` and `S_N2`
D. `S_N2` and `S_N1`

Answer

A

Explanation

A strong nucleophile favours the `S_N2` reaction and a weak nucleophile favours the `S_N1` reaction. First reaction is `S_N1` reaction because `C_2H_5OH` is used as solvent which is a weak nucleophile. Second reaction is `S_N2` reaction because `C_2H_5O^(-)` is Strong nuclcophile.