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Hydrogen bonding is one of the strongest intermolecular forces because it involves a permanent dipole and there exists a high electronegativity difference between the H atom and an N,O, or F atom, leading to a greater attraction.
although they are strong, hydrogen bonds are not stronger intermolecular forces than covalent or ionic bonds so they are not the strongest overall. It is a permanent dipole of sorts and is stronger than typical dipole-dipole attractions.
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