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Which of the following statements are correct ? A. Glycerol is purified by vacuum distillation because it decomposes at its normal boiling point. B. Aniline can be purified by steam distillation as aniline is miscible in water. C. Ethanol can be separated from ethanol water mixture by azeotropic distillation because it forms azeotrope. D. An organic compound is pure, if mixed M.P. is remained same. Choose the most appropriate answer from the options given below :

1. A, B, C only
2. A, C, D only
3. B, C, D only
4. A, B, D only

Correct answer: A, C, D only

Solution

Options A, C, and D are correct because glycerol does decompose at its boiling point, ethanol can be separated from water through azeotropic distillation due to the formation of an azeotrope, and a constant melting point indicates purity in organic compounds. Option B is incorrect as aniline, being miscible in water, cannot be effectively purified by steam distillation.

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