Molecule A (CH₃F) and Molecule B (CH₃I) each possess a dipole moment of 1.9 D, but their molar masses are 34 g mol⁻¹ and 142 g mol⁻¹, respectively. At the same temperature in the liquid phase, which molecule is expected to have the higher boiling point, and which intermolecular force is primarily responsible for the difference? Answer in no more than two sentences.