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Problem- Nitration of phenol: Purification of products (from crude product mixture) step: why do we use 60:40 dichloromethane/hexane solvent mixture to separate 2-nitrophenol and 50:50 dichloromethane /ethylacetate solvent mixture to separate 4-nitrophenol? What is the role of each sovent mixture and its impact on the crude product mixture?

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