1.

Consider the reactions : (1) (CH_(3))_(2)CH-CH_(2)Br overset(C_(2)H_(5)OH)rarr (CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+HBr(2)(CH_(3))_(2)CH-CH_(2)Br overset(C_(2)H_(5)O^(-))rarr (CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+Br^(-)The mechanisms of reactions (i) and (ii) are respectively :

Answer»

`S_(N)1` and `S_(N)2`
`S_(N)1` and `S_(N)1`
`S_(N)2` and `S_(N)2`
`S_(N)2` and `S_(N)1`

Solution :A strong NUCLEOPHILE favours the `SN^(2)` reaction and a weak nucleophile favours the `S_(N)1` reaction.
First reaction is `S_(N)1` reaction because `C_(2)H_(5)OH` used as SOLVENT which US a weak nucleophile.
Second reaction is `S_(N)2` reaction because `C_(2)H_(5)O^(-)` is strong nucleophile.


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