When comparing polar molecules with similar molar masses (around $58 ext{ g/mol}$), which property is most crucial in determining the relative order of their boiling points?
Answer
The magnitude of the dipole moment ($ ext{ extmu}$)
For molecules of similar size where the IMF type is similar or when comparing pure dipole interactions, the relative strength of the permanent charge imbalance, quantified by the dipole moment, dictates the strength of the dipole-dipole attraction and thus the boiling point order.
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