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Question
The intermediate carbocation formed in the reactions of HI, HBr and HCl with propene is the same and the bond energy of HCl, HBr and HI is 430.5 kJ mol–1, 363.7 kJ mol–1 and 296.8 kJ mol–1 respectively. What will be the order of reactivity of these halogen acids?
Solution
The bond dissociation enthalpy decreases in the order HCl > HBr > HI, therefore, the order of reactivity is in the reverse order i.e., HI > HBr > HCl.
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