We use reverse phase column chromatography with a non-polar C18 stationary phase and a mixture of acetonitrile and methanol as mobile phase in order to separate the dye molecules methyl fuchsin, parafuchsin, basic fuchsin and malachite green. What will be the order of elution of these molecules.  Explain.  Why won't these compounds separate using normal phase chromatography with silica and acetone?

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