A) \[HF\]
B) \[HCl\]
C) \[HI\]
D) \[HBr\]
Correct Answer: A
Solution :
Except HF, rest of the hydrogen halides are gases, HF is a liquid with boiling point \[19.5{}^\circ C\]. Due to the association of HF molecules through hydrogen bonding as follows: \[\text{H-F}\,\text{--}\,\text{-H-}\,\text{F}\,\text{-}\,\text{-}\,\text{-H}\,\text{-}\,\text{F}\,\text{-}\,\text{-}\,\text{-H-F}\] Hence, the correct option is (a).
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