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  4. Which of the following is most volatile?

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Q. Which of the following is most volatile?

CMC MedicalCMC Medical 2011

Solution:

The bond strength of $ H-X $ decreases from HF to HI because the dissociation energy of $ H-X $ bond decreases from HP to HI. Hydrogen halide : $ H-F $ $ H-Cl $ $ HBr $ $ HI $ Dissociation energy: 566 431 366 299 $ (kJ\,mo{{l}^{-1}}) $