Which steps are the rate-determining step in the mechanism of radical halogenation?

Question

Quizplus · Accepted Answer

The rate-determining step in the mechanism of radical halogenation is the propagation step. This is because the formation of the first radical intermediate during initiation step occurs with a relatively low activation energy. In contrast, propagation requires the reaction of a radical with a stable molecule to form a new radical intermediate, which has a higher activation energy. Therefore, the reaction rate depends on the rate of the propagation step. While initiation is important in generating radicals, it does not limit the overall reaction rate. Similarly, termination steps do not affect the reaction rate significantly as they involve the destruction of radicals rather than the formation of new ones.

Which Steps Are the Rate-Determining Step in the Mechanism of Radical