SSC MTS EXAM

Detailed explanation-1: -However, the fastest reaction is with an iodoalkane. In these reactions, bond strength is the main factor deciding the relative rates of reaction.

Detailed explanation-2: -Tertiary haloakanes react via an sN1 mechanism that has a much lower activation energy than the sN2 mechanism with the high energy transition state. Hence tertiary haloalkanes react faster then secondary, which in turn react faster than primary.

Detailed explanation-3: -The order of reaction with the different chloroalkanes is that the tertiary halogenoalkane is fastest, followed by the secondary, with the primary halogenoalkane being slowest.