Methods of Purification — Prelims Questions

Which of the following methods is most suitable for purifying a liquid organic compound that decomposes below its normal boiling point?

A mixture of two miscible liquids, A and B, has boiling points $90^circ\text{C}$ and $92^circ\text{C}$ respectively. Which purification technique would be most effective for separating them?

In a Thin Layer Chromatography (TLC) experiment, a compound travels $3.0,\text{cm}$ from the origin, while the solvent front travels $7.5,\text{cm}$. What is the $R_f$ value of the compound?

Which of the following compounds can be purified by sublimation?

Which of the following statements about crystallization as a purification method is INCORRECT?

An organic compound is present in an aqueous solution. To extract this compound, an immiscible organic solvent is used. Which of the following properties is NOT desirable for the organic solvent in this differential extraction process?