Question

Glycerol boils at $290{}^{\circ }C$ with slight decomposition. Impure glycerin can be purified by:

• A. Steam distillation
• B. Vaccum distillation
• C. Simple distillation
• D. Extraction by solvent

Answer 1

The correct option is B Vaccum distillation

It can be purified by vaccum distillation as the liquids which decompose at its boiling point can be purified by vacuum distillation. Glycerol which decomposes at its boiling point can be distilled without decomposition by vacuum distillation.