Hydrogen bonds are generally weaker than covalent bonds. A covalent bond involves the sharing of electron pairs between atoms, which creates a strong bond that holds the atoms together in a molecule. On the other hand, a hydrogen bond is a type of attraction that occurs between a hydrogen atom that is covalently bonded to a more electronegative atom (like oxygen or nitrogen) and another electronegative atom. While hydrogen bonds can be significant in determining the properties of substances (like the high boiling point of water), they do not involve the actual sharing of electrons and are therefore weaker compared to covalent bonds.
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