1.

In a S_(N)2 substitution reaction of the type R-Br+Cl^(-)overset(DMF)rarr R-Cl+Br^(-)which one of the following has the highest relative rate ?

Answer»

`CH_(3)-CH_(2)-CH_(2)Br`
`CH_(3)-UNDERSET(CH_(3))underset("|")("C ")H-CH_(2)Br`
`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-CH_(2)Br`
`CH_(3)CH_(2)Br`

Solution :For such a reaction the rate of `SN^(2)` SUBSTITUTION reaction is maximum in case of `CH_(3)CH_(2)Br` because `SN^(2)` mechanism is followed in case of primary and secondary halidesi.e.,`SN^(2)` reaction is favored by small groups on the CARBON atom attached to halogens so`CH_(3)CH_(2)Br gt CH_(3)CH_(2)CH_(2)Br gt CH_(3)-underset(CH_(3))underset("|")("C ")H-Br gt CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C ")-Br`i.e., option (D) is correct.


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