List the following compounds in order of expected elution from a chromatography column packed with silica gel, using a petroleum ether-diethyl ether solvent system.

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The Answer is From first to last: (b) an aromatic hydrocarbon, (d) a ketone, (a) a phenol, (c) a carboxylic acid. In practice, (a) and (c) would both elute very slowly and would probably be difficult to sepa- rate.

List the Following Compounds in Order of Expected Elution from a Chromatography