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Two liquid compounds whose boiling points differ by less than 20 degrees C are best separated by which technique?

1. Steam distillation
2. Fractional distillation
3. Distillation under reduced pressure
4. Chromatography.

Correct answer: Fractional distillation

Solution

Fractional distillation is the standard method when two miscible liquids differ in boiling point by less than 20 degrees C; the fractionating column gives repeated equilibration stages. Steam distillation is for immiscible high-boiling compounds, and vacuum distillation is for heat-sensitive ones.

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