Arrange the following alkyl chlorides in order of decreasing reactivity in an `S_(N^(1)` reaction :
Channel: Doubtnut
Date: 2020-04-19

Arrange the following alkyl chlorides in order of decreasing reactivity in an `S_(N^(1)` reaction : (I) isopropyl bromide , (II) propyl bromide   (III) tert-butyl bromide , (IV) methyl bromide