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In the reaction of substitution of alkane. There are chain initiation, chain propagation and chain termination. However, when does the chain termination reaction occur? Does it occur simultaneously with the chain propagation reaction and once all the radicals run out, the reaction stop? Or it will occur after the chain propagation reaction finishes?

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    $\begingroup$ This is chemistry. If a reaction can occur, it will occur. Really, imagine two radicals which are about to terminate each other. Do you think they will stop at the mere thought that there might be some unreacted starting compounds at the far corner of the vessel? $\endgroup$
    – Ivan Neretin
    Commented Sep 23, 2021 at 12:19
  • $\begingroup$ Reminds me of an answer I wrote a while ago about combustion, which is (for a large part) also a radical reaction. chemistry.stackexchange.com/a/101967/17952 $\endgroup$
    – Karl
    Commented Sep 23, 2021 at 21:06

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