The correct order of thermal stability of hydrogen halides (H-X) is :

H I > H B r > H C l > H F

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H F > H C l > H B r > H I

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H C l > H F > H B r > H I

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H I > H C l > H F > H B r

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Solution

The correct option is C $H F > H C l > H B r > H I$
As we move down the group in hydrogen halides the thermal stability decreases due to decrease in bond strength.So the correct order of thermal

stability is $H F > H C l > H B r > H I$
Hence ,option B is correct.

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