HI is stronger acid than HF. Explain. - Vidyadip

Question

HI is stronger acid than HF. Explain.

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Answer

This is due to the fact that the bond strength (or bond dissociation energy) of H-I bond is minimum and that of HCl is maximum and hence HI is capable of giving I ions very easily. Thus the tendency to donate the electron pair (nucleophilicity) to carbon of halide decreases in the order $ I^{-} > Br^{-} > Cl^{-} $, the order of reactivity of halogen acids decreases in the same order $ HI > HBr > HCl $.

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