Answer:
(a) HF ® Hydrogen bonding
\[HCl,\,\,\,HBr,\,\,HI\,\to \]
Dipole-dipole interaction, London-dispersion force.
(b) London-dispersion force is
dominant because boiling point is not in the order of decreasing electro negativity
of halogens.
(c) HF involves strong
intermolecular hydrogen bonding, hence its boiling point is highest.
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