Out of $H C l O, H B r O$ and $H I O$ which one is most acidic :

H B r O

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H C l O

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H I O

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All are equally acidic

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Solution

The correct option is B $H C l O$
As $C l$ is most electronegative out of $C l, B r, I$ , it will make the $C l - O$ bond more polar and weaker compared to $B r$ and $I$ .

Therefore, $H C l O$ will be most acidic.

Hence the correct option is B.

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