Which of the following is the rate-determining step in the free-radical bromination of methane?

Name: Which of the following is the rate-determining step in the free-radical bromination of methane?
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In the free-radical bromination of methane, the rate-determining step is the generation of the first free radicals, which occurs by homolytic cleavage of the bromine molecule. This is represented by step 1 in mechanism B. Steps 2 and 3 show propagation steps, and step 4 shows a termination step.

Which of the Following Is the Rate-Determining Step in the Free-Radical