Which intermolecular forces occur between water molecules?
The intermolecular forces between water molecules are the hydrogen bond.
The hydrogen bond is a force of attraction between hydrogen atoms that are covalently bonded to atoms of electronegative elements like oxygen, fluorine and nitrogen and other electronegative atoms that could be located in the same molecule or which are located in other molecules.
The hydrogen bond is one which has an intermediate strength that lies between that of van der Waals interactions and general covalent and ionic bonds which lead to the creation of molecules.
The hydrogen bonds between water molecules result in the high boiling point of water compared to molecules of hydrogen with other elements which does not result in the creation of hydrogen bonds.