The strongest are the Hydrogen bonds, then comes the dipole-dipole forces and at last are the dispersion forces.
Intermolecular forces of attraction are the forces that occur between the atoms of the molecules. There are many types of Intermolecular forces of attraction. Hydrogen Bonds are the molecular forces that occur between Hydrogen and other atom for example fluorine, oxygen and nitrogen. Dipole - Dipole forces of attraction occur between slight positive and slight negative atoms of the molecule. For example, the bonds between NH₃. Dispersion forces are the weakest and occur between any atoms that are joined with a covalent bond that is bond formed by sharing a pair of electrons between the atoms. For example, bonds in CH₄.
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