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?

Explanation

The bond dissociation enthalpy decreases in the order. `HCl gt HBr gt HI`, therefore, the order of reactivity is in the reverse order i.e., `HCl gt HBr gt HI`