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

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^{o} C

290^{\circ} C

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