Presence of peroxides affects the addition of

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(A) The peroxide effect,also known as the $Kharasch$ effect or anti-$Markownikoff$ addition,is specifically applicable only to $HBr$ in the presence o

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$HBr$

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(A) The peroxide effect,also known as the $Kharasch$ effect or anti-$Markownikoff$ addition,is specifically applicable only to $HBr$ in the presence of organic peroxides. For $HCl$ and $HI$,the peroxide effect is not observed because the bond dissociation energy of $HCl$ is too high to be cleaved by free radicals,and the iodine radical formed in the case of $HI$ tends to combine to form $I_2$ rather than adding to the double bond. Therefore,the correct option is $A$.

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