A) Hydrogen bond and Electrovalent bond

Here are the differentiations:

a) Hydrogen bond and Electrovalent bond

• A hydrogen bond is a weak intermolecular force of attraction between a hydrogen atom covalently bonded to a highly electronegative atom (like O, N, F) and another nearby electronegative atom. It is an intermolecular force.
• An electrovalent bond (or ionic bond) is a strong intramolecular force formed by the complete transfer of electrons from one atom (typically a metal) to another (typically a non-metal), resulting in oppositely charged ions that attract each other. It is an intramolecular force.

b) Covalent bond and Van der Waals forces

• A covalent bond is a strong intramolecular force formed by the sharing of one or more pairs of electrons between two atoms, typically non-metals.
• Van der Waals forces are weak intermolecular forces of attraction that arise from temporary or permanent dipoles in molecules. They include London dispersion forces, dipole-dipole interactions, and dipole-induced dipole interactions.