Question #71270
WHY DOES ONLY HBr give anti anrkownikovs product in presence of per oxide among all the halo acid
Expert's answer
Because only HBr produces a Br-radical (in presence of peroxide), which then reacts with the double bond. It is considered that HF and HCl are too stable to produce free radicals. HI produces I-radicals, but they have not enough activity for starting of radical chain reaction.
This is also known as “the peroxide effect” or “the Kharasch effect”.
This is also known as “the peroxide effect” or “the Kharasch effect”.
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