Question

define peroxide effect. please answer

Answer 1

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Answer 2

Peroxide effect: The change in regioselectivity of the addition of HBr to an alkene or alkyne in the presence of a peroxide. The regioselectivity for the addition reactions of other electrophiles such as HCl and H3O+ are not altered in the presence of a peroxide.


In the absence of a peroxide, HBr adds to propene via an ionic mechanism (with a carbocation intermediate) to give 2-bromopropane. Markovnikov's Rule is obeyed.


In the presence of a peroxide such as HOOH, HBr adds to propene in an anti-Markovnikov sense and via a radical mechanism, giving 1-bromopropane.