peroxide effect

Question

Addition of HBr to alkenes in presence of peroxide gives:

RankGuru · Accepted Answer

The **Peroxide Effect** (or **Kharasch Effect**) occurs only with **$HBr$** (not $HCl$ or $HI$).
- In the presence of organic peroxides, the addition of $HBr$ to an alkene follows an **Anti-Markovnikov** pathway.
- **Mechanism**: This is a **free radical mechanism**. The peroxide generates $Br^.$ radicals. The bromine radical adds to the less substituted carbon to form a more stable substituted carbon radical intermediate.
- Example: Propene $+ HBr + 	ext{peroxide} 	o$ **1-Bromopropane**.

Rank Guru

peroxide effect

Select the correct option: