Practice!

Sample Problem

Which of the following forces exist in molecular crystals?

Covalent bond

Dispersion force

Dipole-dipole

Ionic bond

Hydrogen bond

Solution

In a molecular crystal, the lattice points are occupied by molecules, and the attractive forces between them are van der Waals forces and/or hydrogen bonding. Thus, dispersion force, dipole-dipole, and hydrogen bond all exist in molecular crystals.