The P Block Elements - Result Question 65
####68. The variation of the boiling point of the hydrogen halides is in the order $HF>HI>HBr>$ $HCl$. [2015 RS]
What explains the higher boiling point of hydrogen fluoride?
(a) The electronegativity of fluorine is much higher than for other elements in the group.
(b) There is strong hydrogen bonding between $HF$ molecules
(c) The bond energy of HF molecules is greater than in other hydrogen halides.
(d) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
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Solution:
- (b) The H-bonding is present in HF due to high electronegativity of fluorine atom. While $H-$ bonding is not present in $HI, HBr$ and $HCl$.
