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-I Effect

HF; HCl; HBr;...

Question

HF; HCl; HBr; HI
Arrange the above acids in terms of strength.

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Solution

HF < HCl < HBr < HI
Down the group the electronegativity decreases and the size increases.
Thus, it becomes easy to lose $H^{+}$ ion. This causes the increase in acidic strength down the group.

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