Which of the most volatile compounds?

H I

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H C l

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H B r

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H F

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Solution

The correct option is A $H C l$
The boiling point of $H F$ is highest due to H-bonding.
For other halogen acids boiling point. increase in the order
$H C l < H B r < H I$
Therefore, most volatile (with Lower boiling point) is $H C l$

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