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Why HF is the weakest acid among HCl, HBr and HI though its electronegetivity is highest?
Why is the bond between hydrogen and fluorine the strongest among the acid molecules?
The bond between hydrogen and fluorine is the strongest due to the electronegativities of these two atoms. Fluorine is the most electronegative element in the periodic table, and hydrogen has a partial positive charge due to its low electronegativity. Therefore, the bond between them is polar covalent with the electron density skewed toward the fluorine atom, making it difficult for hydrogen to dissociate from the fluorine and become an H+ ion.