Question

What type of intermolecular force exists between polar molecules?

• A. Vant Hoff Factor.
• B. London Dispersion Forces.
• C. Dipole-dipole.
• D. Polar.

Answer 1

The correct option is C Dipole-dipole.

Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dipole-dipole forces have strengths that range from 5 kJ to 20 kJ per mole. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).

The figures show two arrangements of polar iodine monochloride (ICl) molecules that give rise to dipole-dipole attractions