Rank the following substances from strongest to weakest overall intermolecular attractions, and justify the ranking in one sentence.
(i) n-butane, C₄H₁₀; molar mass = 58 g·mol⁻¹; dipole moment = 0 D
(ii) chloromethane, CH₃Cl; molar mass = 50 g·mol⁻¹; dipole moment = 1.9 D
(iii) ethanol, CH₃CH₂OH; molar mass = 46 g·mol⁻¹; capable of hydrogen bonding