The stability of hydrogen halides is in the order of:

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

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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 B r > H I > H F

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Solution

The correct option is A $H F > H C l > H B r > H I$
Due to large difference in electronegativity of upper halogens and hydrogen, they are more stable than lower hydrogen halide.

$∴$ Stability order: $H F > H C l > H B r > H I$ .

Hence, option C is correct.

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

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

H F, H C l, H B r, H I

H F, H C l, H B r, H I

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