Given below are four statements regarding the purification of organic compounds: Statement I: Simple distillation is used to separate liquids having a boiling point difference of less than 10 K. Statement II: In fractional distillation, the fractionating column provides surfaces for heat exchange between ascending vapours and descending condensed liquid. Statement III: Glycerol is separated from spent-lye using disti

Step-by-step solution

Statement I is incorrect because simple distillation is used for liquids with a sufficient difference in boiling points. For liquids with a small boiling point difference (such as less than 10 K), fractional distillation is required. Statement II is correct as the fractionating column provides a large surface area for heat exchange between the ascending vapours and the descending condensed liquid. Statement III is correct because glycerol decomposes at its normal boiling point, so it must be distilled under reduced