Peroxide effect is observed with the addition | vedclass

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(B) The peroxide effect (Kharasch effect) is observed with the addition of $HBr$ to unsymmetrical alkenes because the $H-Br$ bond can be homolytically

Vedclass · Accepted Answer

$H-I$ bond is weaker than $H-Br$ bond so that iodine free radicals combine to form iodine molecules

Vedclass · Answer

(B) The peroxide effect (Kharasch effect) is observed with the addition of $HBr$ to unsymmetrical alkenes because the $H-Br$ bond can be homolytically cleaved by free radicals generated from the peroxide. However,in the case of $HI$,the $H-I$ bond is very weak. When iodine free radicals are generated,they are highly unstable and rapidly combine with each other to form stable $I_2$ molecules instead of attacking the alkene double bond. The reaction is: $I^{\bullet} + I^{\bullet} \rightarrow I_2$ (Unstable) (Stable) Therefore,the anti-Markovnikov addition is not observed for $HI$.

Peroxide effect is observed with the addition of $HBr$ but not with the addition of $HI$ to unsymmetrical alkene because

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