Types of van der Waals Forces (i.e., Intermolecular Forces):
        basically Electrostatic in nature
        forces between partially developed charges ( i.e., "dipole")

(1) Dipole/Dipole Force
      between two  polar molecules

(2) Dipole/Induced Dipole Force
      between a polar & a nonpolar  molecules

(3) Induced Dipole/Induced Dipole Force (Dispersion or London Force)
      between two nonpolar  molecules

(4) Hydrogen Bonding Force
      between molecules with a hydrogen attached to a very elecrtonegative atoms
      such as F, O and N.