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  4. Glycerol boils at 290oC with slight decomposition. Which of the following method is used to purify impure glycerine?

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Q. Glycerol boils at $290^{o}C$ with slight decomposition. Which of the following method is used to purify impure glycerine?

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

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