Use the information and data given below to answer the questions (a) to (c):
• Stronger intermolecular forces result in higher boiling point.
• Strength of London forces increases with the number of electrons in the
molecule.
• Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and
238 K respectively.
(a) Which type of intermolecular forces are present in the molecules
HF, HCl, HBr and HI?
(b) Looking at the trend of boiling points of HCl, HBr and HI, explain
out of dipole-dipole interaction and London interaction, which one
is predominant here.
(c) Why is boiling point of hydrogen fluoride highest while that of
hydrogen chloride lowest?
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