A) HF > HCl > HBr > HI
B) HF < HCl < HBr < HI
C) HP > HCl < HBr = HI
D) HF > HCl = HBr > HI
Correct Answer: A
Solution :
The thermal stability of hydrogen halide decreases from HF to HI. HF is the most stable whereas HI is least stable. The decrease in stability of the hydrides is due to decrease in bond strength which decreases on moving downward in the group. Hence, decreasing order of stability of hydrogen halide is HF > HCl > HBr > HI
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