Question

What is perroxide effect? Why is it applicable only in the case of addition oh HBr and not in the case of hcl and Hi

Answer 1

Hi!

I'm not sure what it means EXACTLY but this is the reason.

In case of HCl, the abstraction of H ion from HCl is endothermic and hence further reaction is not possible because heat is required for the peroxide effect.

And in case of HI , even though the abstraction of H ion from HI is exothermic, the addition of I ion free radical to alkene is endothermic. Hence addition with HI is less likely to occur.

Hope this helped you!

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