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Question

Which of the following is purified by vacuum distillation?

A
Glycerine
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B
Glycerol
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C
Propane1,2,3triol
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D
Ethanol
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Solution

The correct option is C Propane1,2,3triol
Compounds which decompose at a temperature below their boiling point cannot be distilled at atmospheric pressure. On reducing the pressure, the liquid will boil at lower temperture.
Glycerine, glycerol and propane1,2,3triol are decomposed under the boiling point. So these are purified by vaccum distillation.

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