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Polar molecules tend to have higher boiling/melting points because they have greater intermoleculr forces than nonpolar molecules do. Nonpolar molecules only have van der Waals forces acting between molecules., which is the weakest form of intermolecular force. Polar molecules have dipoles that give rise to stronget intermolecular forces, such as hydrogen bonding or dipole-dipole forces that make it harder to break apart.
If a molecule is more polar, it has more intermolecular forces since it has London dispersion forces and dipole-dipole and possibly more. Therefore, since it has more forces acting upon it, polar molecules tend to have higher boiling points.
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