Which statement about intermolecular forces is not true?

a.In a sample of CCI, intermolecular forces occur between CCla molecules.
b. Dipole-dipole intermolecular forces are found to be polar molecules.
c.London (dispersion) forces are weaker for CHCHCHCHCH2CHz than CHa-d.For molecules of a similar size, hydrogen-bonding is generally stronger than London (dispersion) forces.
e. Samples of nonpolar molecules usually exhibit London (dispersion) forces only.

d.For molecules of a similar size, hydrogen-bonding is generally stronger than London (dispersion) forces.