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Hydrogen bonds are extremely powerful. This is because an extremely electronegative atom, such as O, pulls the electron on the Hydrogen atom towards them, leaving the H side partially positive. This partial positive H can react with the partial negative lone pairs of the O of another molecule.
Yes, hydrogen bonds are the strongest IMF. The δ+ hydrogen is so strongly attracted to the lone pair on the other atom that it is almost as if you were beginning to form a covalent bond. It doesn't go that far, but the attraction is significantly stronger than an ordinary dipole-dipole interaction.
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