HF is the most stable among all the hydrogen halides. Explain. ##… - Vidyadip

Question

HF is the most stable among all the hydrogen halides. Explain.
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Explain the thermal stability of hydrogen halides.

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Answer

HF is the most stable among all the hydrogen halides.
The thermal stability decreases from HF to HI.
This is due to a decrease in bond dissociation enthalpy and bond strength of H-X bond from F to I.
Down the group, from F to I, atomic size increases, bond length of H-X bond increases, bond polarity decreases and hence bond strength decreases.
F being of the lowest atomic size and the highest electronegativity, HF bond is stronger and highly thermally stable.

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