Q24Short answer
The intermediate carbocation formed in the reactions of HI, HBr and HCl with –1 propene is the same and the bond energy of HCl, HBr and HI is 430.5 kJ mol , –1 –1 363.7 kJ mol and 296.8 kJ mol respectively. What will be the order of reactivity of these halogen acids?
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Bond dissociation energy is least for HI and maximum for HCl therefore, order of reactivity will be HI > HBr > HCl. ⊕