Which of the following is a common method for purifying organic compounds?

Distillation is a widely used method for purifying organic compounds, particularly when separating components based on their boiling points. This technique is effective in obtaining a pure liquid from a mixture, as it involves heating the solution to vaporize the solvent or volatile component and then cooling the vapor back into a liquid in a separate vessel. The differing boiling points allow for the separation of the desired compound from impurities or other components in the mixture.

In the context of organic chemistry, distillation can be particularly useful for isolating solvents, separating organic liquids, or obtaining purified reaction products. This is especially relevant when the impurities have significantly different boiling points or when careful fractional distillation is applied, allowing for better separation when the boiling points are closer together.

Other methods listed, while useful in certain contexts, are not as universally applicable for the purification of organic compounds as distillation. For instance, filtration is more suited for separating solid particles from liquids or gases rather than refining the purity of a liquid organic compound. Centrifugation separates components based on density and is often used in biological applications rather than pure organic chemistry contexts. Sublimation can purify certain solids by transitioning them directly from a solid to a gas and then back to a solid, but it is less common than