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Reactivity of hydrogen halides towards alkenes follows:
AHBr > HCl > HI
BHCl > HBr > HI
CHI > HBr > HCl
DHBr > HI > HCl
Answer & Solution
Correct answer: C. HI > HBr > HCl
The H-I bond is the weakest, so HI adds fastest and HCl slowest.
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