Which of the following statements about intermolecular forces is(are) true?
a. London dispersion forces are the only type of intermolecular force that nonpolar molecules exhibit.
b. Molecules that have unly London dispersion forces will always be gases at room temperature (25∘C).
c. The hydrogen-bonding forces in NH3 are stronger than those in H2O
d. The molecules in SO2(g) exhibit dipole-dipole intermolecular interactions.
e. CH3CH2CH3 has stronger London dispersion forces than does CH4.