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This would be based primarily off memorization and then identification. The way we can see this is induced-dipole-induced-dipole in every aspect of every molecule due to the slight polarization in electron cloud. The next one we can look at is dipole-dipole which occurs any time that there is a significant enough difference in the electronegativity of the two atoms being bonded and therefore a slight change in charge. The following would be H-bonding which is simply a form of dipole-dipole bonding that occurs when hydrogen is bonded to either F, O, or N. Lastly, there is ionic forces which occur with a cation and anion due to the difference in charge.
if it is nonpolar then it will only be affected by dispersion forces. If it is non-polar it will be affected by dipole-dipole forces. if there are H bonded to N,O,F then it will experience H bonding.
Everything has dispersion forces. Nonpolar molecules can only have london dispersion intermolecular forces. Polar molecules also have dipole-dipole in addition to london dispersion forces. You can tell the type of intermolecular force based on the charges on the substance, either full charge, partial charge, or no charge.
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