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FAQ: why does only HBr give the antimarkownikoff reaction whereas no other halogen acid gives this reaction? Answer: Because the H-Cl bond energy is greater than that of H-Br,hence the peroxide free radical will not be able to break H-Cl bond.The H-I bone is weaker than H-Br.The iodine free radical formed combines immediately with another to form the iodine molecule.

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