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

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Solution:


Hydrogen Halides like usually react with alkenes using an electrophilic addition mechanism. However, in the presence of organic peroxides, 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.