Discussion
Which of the following compound has the highest boiling point?
Answer: B
The highest boiling point is that of propan-1-ol.
These compounds have similar molar masses (44 to 60 g/mol), so the type of intermolecular force decides the order. Propan-1-ol molecules form hydrogen bonds through their O-H groups, the strongest attraction here, so it boils at 97°C.
Propanal (49°C) and acetone (56°C) have only dipole-dipole attractions, methoxymethane (−24°C) is a weakly polar ether, and n-butane (about 0°C) has only dispersion forces.
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