Which of the following interactions is not a part of van der Waals interactions?

Ion-dipole interaction is not counted in van der Waals forces. The term van der Waals force is a general term for those intermolecular forces that include all forces except ion-dipole forces when are relatively strong. Ion-dipole forces occur between an ion(either a cation or an anion) and a polar molecule. The Dutch physicist J van der Waals was the first to suggest the importance of intermolecular forces.