Which of the following statements is incorrect?
Correct answer: B. I2, C10H5, C6H5COOH undergo sublimation
- A. The use of sintered glass crucible is most convenient way of filtration
- B. I2, C10H5, C6H5COOH undergo sublimation
- C. In solvent extraction, organic solvent is shaken with aqueous solution to increase area of contact
- D. Rf value always has a certain unit
Explanation
This statement is incorrect because not all substances listed undergo sublimation. Sublimation is the process by which a substance transitions directly from a solid to a gas phase without passing through the liquid phase. While iodine (I2) does undergo sublimation, neither naphthalene (C10H8) nor benzoic acid (C6H5COOH) typically sublimes under standard conditions. Naphthalene sublimes readily, but benzoic acid generally decomposes before undergoing sublimation.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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