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The correct order of the thermal stability of hydrogen halides (H − X) is

1. HI > HBr > HCl > HF
2. HF > HCl > HBr > HI
3. HCl < HF > HBr < HI
4. HI > HCl < HF < HBr

Correct answer: HF > HCl > HBr > HI

Solution

Thermal stability of hydrogen halides decreases down the group as bond strength weakens: HF>HCl>HBr>HI, option index 1, not the stored reverse order.

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