In the presence of peroxide,HCl and HI do not | vedclass

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(A) Anti-Markownikoff addition (peroxide effect) is observed only with $HBr$. In the mechanism,the addition of the halogen radical to the alkene is ex

Vedclass · Accepted Answer

One of the steps is endothermic in $HCl$ and $HI$

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(A) Anti-Markownikoff addition (peroxide effect) is observed only with $HBr$. In the mechanism,the addition of the halogen radical to the alkene is exothermic for all hydrogen halides. However,the step involving the abstraction of a hydrogen atom from the hydrogen halide by the alkyl radical is crucial. For $HBr$,this step is exothermic,making the overall reaction favorable. For $HCl$,the $H-Cl$ bond is very strong,making this step endothermic. For $HI$,the $I-I$ bond formation is exothermic,but the addition of the iodine radical to the alkene is endothermic,making the overall process unfavorable. Therefore,$HCl$ and $HI$ do not undergo anti-Markownikoff's addition.

In the presence of peroxide,$HCl$ and $HI$ do not give anti-Markownikoff's addition to alkenes because

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