The addition of HI in the presence of peroxid | vedclass

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Question

(D) The peroxide effect (anti-Markovnikov addition) is observed only with $HBr$. For $HI$,the $H-I$ bond dissociation energy is low,allowing for homol

Vedclass · Accepted Answer

Iodine atom is not reactive enough to add across a double bond

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(D) The peroxide effect (anti-Markovnikov addition) is observed only with $HBr$. For $HI$,the $H-I$ bond dissociation energy is low,allowing for homolytic cleavage to form $I^{\bullet}$ radicals. However,the iodine radical $(I^{\bullet})$ is not reactive enough to add across the double bond of an alkene. Instead,two iodine radicals recombine to form $I_2$ molecules,thus preventing the chain propagation step required for anti-Markovnikov addition.

The addition of $HI$ in the presence of peroxide catalyst does not follow anti-Markovnikov's rule because

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