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In order of decreasing boiling point, CH3OH > H2S > C2H6 > Ar. The strongest types of bonding are ionic, covalent, hydrogen, and van der waals forces, in that order.
London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are different intermolecular forces. All substances have LDF, but molecules can have combination of these three types of intermolecular interactions.
The dipole-dipole forces increase with increasing polarity. Dipole-dipole forces are in an unique (stronger) case in this situation. It is possible for it to exist between a molecule with an N, O, or F atom that has a hydrogen atom bonded to it directly and another molecule with an N, O, or F atom that has a lone pair of electrons.
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