Why are hydrogen bonds not chemical bonds?

Hydrogen bonds are not chemical bonds, but intermolecular forces.

Hydrogen is bound to the electronegative atom X through valence bond. If it is close to the atom Y(OFN, etc. ) large electronegativity, small radius, X-H between x and y? This special Y-type intermolecular or intramolecular interaction is called hydrogen bonding.

Hydrogen bonding Hydrogen bonding is an electrostatic action, which is another intermolecular force besides van der Waals force. The size of hydrogen bond is between chemical bond and van der Waals force. It is not a chemical bond, but it has bond length and bond energy, and it is saturated and directional.

Generally, substances that can form hydrogen bonds between molecules have high melting points and boiling points. This is because when a solid melts or a liquid gasifies, besides the van der Waals force, the hydrogen bond between molecules must be destroyed, which requires more energy. The melting point of substances that can form intermolecular hydrogen bonds in similar compounds is higher than that of substances that cannot form intermolecular hydrogen bonds.