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Which alkyl halide from the following wo...

Which alkyl halide from the following would you expect to react more rapidly by `S_(N)2` mechanism ?

A

`CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2)Br`

B

`CH_(3)CH_(2)underset(CH_(3))underset(|)CHCH_(2)Br`

C

`CH_(3)CH_(2)overset(CH_(3))overset(|)underset(CH_(3))underset(|)C CH_(2)Br`

D

`CH_(3)CH_(2)underset(CH_(3))underset(|)CHBr`

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_(3)underset(CH_(3))underset(|)CHCH_(2)CH_(2)Br`
Out of the given compounds, three are primary halides The presence of methyl group closer to halide group increases the steric hindrance and decreases rate of the reaction. Hence, compound (a) reacts rapidly.
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