Why is the boiling point of ethylene glycol significantly higher than that of ethanol?

univerkov | June 20, 2021 | education

Since ethylene glycol (glycol) is a dihydric alcohol (HO-CH2-CH2-OH), and ethanol (ethyl alcohol) is a monohydric alcohol (CH3-CH2-OH), then due to an additional hydrogen bond for boiling ethylene glycol (197.3 C) much more energy needs to be spent than for ethanol (78.4 C). This property can be explained by the fact that the molecules of ethylene glycol are attracted more strongly than that of ethanol, due to the special intermolecular forces, which are due to the coordination bivalence of the hydrogen atom.

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