A) HF
B) \[\text{HCl}\]
C) HI
D) \[\text{HBr}\]
Correct Answer: A
Solution :
As the size of halogen atom increases, the boiling point of hydrogen halides increases. However, HF has the highest boiling point among the hydrogen halides because of H-bonding and \[\text{Boiling point }\alpha \,\text{= }\frac{\text{1}}{\text{volatlity}}\] Thus, HF is least volatile among hydrogen halides.
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