Glycerol boils at $290^{o} C$ with slight decomposition. Impure glycerine can be purified by

Steam distillation

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Simple distillation

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Vacuum distillation

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Extraction with a solvent

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Solution

The correct option is C Vacuum distillation
The liquids which decompose at its boiling point can be purified by vacuum distillation. Glycerol which decomposes at its boiling point (–563K) can be distilled without decomposition at 453K under 12mm Hg pressure.

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Glycerol boils at 290^oC with slight decomposition. Impure glycerine can be purified by[CPMT 1983, 94]

290^{\circ} C

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