The normal boiling point of CH3Cl(l) is significantly higher than that of CH4(l). Which additional intermolecular force present in liquid CH3Cl most directly accounts for this difference?
a) London dispersion forces arising from the polarizability of the Cl atom
b) Dipole–dipole interactions between CH3Cl molecules
c) Hydrogen bonding between the Cl atom and H atoms on neighbouring molecules
d) Ion–dipole attractions between CH3Cl and Cl− ions formed in the liquid