Question

choose two compounds from the list of unknowns that you would expect to separate easily by column chromatography and two different compounds that would likely be difficult to separate by column chromatography. explain your choices, including the structures of the compounds.

Answer 1

The two compounds which are easily to separate are Naphthalene and Benzoic acid. Two compounds hard to separate are Naphthalene and Trans-stilbene.

There are two reasons for the compounds which are easy to separate.

a. They must be similar enough in terms of their FG to allow us to use the same elution solvent, but they must also differ enough in terms of polarity to allow us to successfully separate the fractions.

c. Both benzene rings—BA-1 and Napthalene-2—are present. But BA contains a more polar, long-lasting RCOOH group that will elute and spend more time interacting with the absorbent.

Two compounds hard to separate are Naphthalene and Trans-stilbene. The reason that they are too hard to separate is that their functional groups and polarities are too similar.

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