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p- Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryp- Block Elements2 Marks
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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