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  4. Reaction of HBr with propene in the presence of peroxide gives

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Q. Reaction of $HBr$ with propene in the presence of peroxide gives

AIPMTAIPMT 2004Hydrocarbons

Solution:

$CH _{3} CH = CH _{2}+ HBr \xrightarrow{\text { peroxides }}CH _{3} CH _{2} CH _{2} Br$
Hydrogen Halides like $HBr$ usually react with alkenes using an electrophilic addition mechanism. However, in the presence of organic peroxides, $HBr$ adds to the carbon across the double bond which carries a lesser number of hydrogen atoms. This is called AntiMarkownikoff's rule.
This is called the peroxide effect or Anti-Markovnikovs rule.