A) \[HF>HI>HBr>HCl\]
B) \[HF>HBr>HI>HCl\]
C) \[HCl>HBr>HI>HF\]
D) \[HCl>HI>HBr>HF\]
Correct Answer: A
Solution :
Boiling point of hydrogen halides increase with increasing molecular mass because van der Waals' force of attraction increase with rise in molecular weight. Hydrogen fluoride (HF) has abnormally high boiling point due to their existence as a polymeric compound by forming inter-molecular hydrogen bonding. Thus decreasing order of boiling point is\[\underset{\begin{smallmatrix} (least \\ volatile) \end{smallmatrix}}{\mathop{HF>}}\,HI>HBr\underset{\begin{smallmatrix} (most \\ volatile) \end{smallmatrix}}{\mathop{>HCl}}\,\]
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