Question

Hbr is added to propene in presence of peroxide

Answer 1

in the presence of organic peroxides, this is often known as the peroxide effect or anti-Markovnikov addition. In the absence of peroxides, hydrogen bromide adds to propene via an electrophilic additionmechanism. That gives the product predicted by Markovnikov's Rule.


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Answer 2

This is known as Markovnikov's Rule. Because the HBr adds on the wrong way around in the presence of organic peroxides, this is often known as the peroxide effect or anti-Markovnikov addition. In the absence of peroxides, hydrogen bromide adds to propane via an electroscopic addition mechanism.