CsI is an ionic compound, One must break the lattice energy of the crystal just to melt it, then overcome the forces of attraction between ions (much larger than H bonding forces).
According to Wikipedia, HF boils just below room temperature.
http://en.wikipedia.org/wiki/Hydrogen_fluoride
Why is HF has lower boiling point than CsI, even though HF has hydrogen bond.
Does HF have higher boiling point than O2
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