The forces of attraction between the molecules of a compound are called inter molecular forces.usually these forces are much weaker than bonding forces with in these molecules. These forces are strong in solid and liquid but much weaker in gases molecules.there are three types of inter molecular forces.1.Dipole-Dipole Forces. 2.Hydrogen Bonding. 3.Ion Dipole forces. They are collectively called Vander waals Forces.
Dipole-Dipole forces are present between molecule of a polar compound due to the difference of the electronegative values of the bonded atoms.e.g HCl
Hydrogen Bonding. These forces are between hydrogen and highly electronegative atom. They are much stronger than Dipole-dipole forces.e.g water, HF
3.Ion dipole forces. These forces are present between Ion of one molecule to the ion of another molecule they are stronger than Dipole-Dipole forces but weaker than hydrogen bonding . e.g Na+ Cl-.
Dipole-Dipole forces are present between molecule of a polar compound due to the difference of the electronegative values of the bonded atoms.e.g HCl
Hydrogen Bonding. These forces are between hydrogen and highly electronegative atom. They are much stronger than Dipole-dipole forces.e.g water, HF
3.Ion dipole forces. These forces are present between Ion of one molecule to the ion of another molecule they are stronger than Dipole-Dipole forces but weaker than hydrogen bonding . e.g Na+ Cl-.