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In the presence of peroxide addition of ...

In the presence of peroxide addition of HBr to propene takes place according to anti Markownikoff's rule but peroxide effect is not seen in the case of HCl and HI. Explain.

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H-Cl bond is stronger `(430kJmol^(-1))` than H - Br bond `(364kJmol^(-1))` and so not cleaved by the fee radical, whereas the H-1 bond is weaker `(297kJmol^(-1))` and so iodine free radicals combine to form iodine molecules instead of adding to the double bond.
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