A) \[HI>HClHBr\]
B) \[HClHBr<HI\]
C) \[HF>HCl>HBr>HI\]
D) \[HI>HBr>HCl>HF\]
Correct Answer: C
Solution :
In a group,\[\Delta G_{f}^{o}(HX)\]changes -ve to + ve downwards. \[HF(g)\Delta G=-\text{ }273\text{ }.20\text{ }kJ\text{ }mo{{l}^{-1}}\] \[HI(g)\Delta G=+\text{ }1.72kJmo{{l}^{-1}}\] Thus, HF is thermally stable and HI not. Thus,\[HF>HCl>HBr>HI\]or thermal stability of hydrogen halides decreases down the group with an increase in\[HX\]bond length.
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