Which of the following compounds has the highest boiling point?

Step-by-step solution

Boiling point depends on the strength of intermolecular forces. CH ₃ -CH ₂ -CH ₃ is non-polar and has only weak London dispersion forces. CH ₃ -O-CH ₃ and CH ₃ -Cl are polar and have dipole-dipole interactions, but their dipole moments are relatively small. CH ₃ -CN has a highly polar - CN group, resulting in a very high dipole moment and strong dipole-dipole interactions. Due to the strongest intermolecular forces, CH ₃ -CN has the highest boiling point among the given compounds. Answer: CH ₃ -CN