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Question

The acidity (acid strength) of halo acids increases in the order:

A
HCl<HF<HBr<HI
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B
HF<HCl<HBr<HI
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C
HF<HCl<HI<HBr
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D
HF<HBr<HCl<HI
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Solution

The correct option is B HF<HCl<HBr<HI
HF displays hydrogen bonding and also the bond strength is the greatest in HF. The bond dissociation energy decreases in the order HF>HCl>HBr>HI. Further, the decrease in electronegativity and increase in atomic size increases the acidity of halogen hydrides.
Therefore the order of acidity is HF<HCl<HBr<HI.

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