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  3. Chemistry
  4. In the presence of peroxide, HCl and HI do not give anti-Markownikoff' s addition to alkenes because :

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

JEE MainJEE Main 2014Hydrocarbons

Solution:

Anti-Markownikoff addition is possible only in case of $HBr$ and not in $HCl$ and $HI$. In $HBr$ both the chain initiation and propagation steps are exothermic, while in $HCl$, first step is exothermic, and second step is endothermic and in $HI$, no step is exothermic. Hence $HCl$ and $HI$ do not undergo anti-Markownikoff’s addition.