Chemical Bonding Result Question 2
2. HF has highest boiling point among hydrogen halides, because it has
(2019 Main, 9 April II)
(a) lowest ionic character
(b) strongest van der Waals’ interactions
(c) strongest hydrogen bonding
(d) lowest dissociation enthalpy
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Answer:
Correct Answer: 2. ( c )
Solution:
- HF has highest boiling point among hydrogen halides because it has strongest hydrogen bonding. Here, the hydrogen bond exists between hydrogen of one molecule and fluorine atom of another molecule as shown below.
$ \ldots \stackrel{+}{\mathrm{H}} \quad \text { F… } \stackrel{+}{\mathrm{H}} \quad \text { F…H } \quad \text { F } $
In this molecule, hydrogen bond behaves like a bridge between two atoms that holds one atom by covalent bond and the other by hydrogen bond.
BETA
