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All molecules that don't have dipole moments do have London dispersion forces. You can treat this force as the "default" force between molecules if there are no dipole-dipole or ionic intermolecular forces. This is because naturally, molecules create temporary dipoles with each other for a period of time, then they go away. hope this helps!
Yes, all molecules have London Dispersion interactions. This is because at any instant, the electron clouds of atoms and molecules are not uniform. One region can have a fleeting partial charge while another has a fleeting negative charge. These interactions can therefore occur between all molecules, even nonpolar molecules and in monatomic gases.
All molecules have london dispersion forces because it is experimentally observed that the electron clouds in molecules are not fixed and tend to move around, which results in temporary dipole moments that create the london dispersion forces in neighboring molecules.
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