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A good eluent for separating isobutanol and isobutyl oleate using column chromatography would be a mixture of hexane and ethyl acetate. Hexane is a non-polar solvent, while ethyl acetate is more polar. By gradually increasing the proportion of ethyl acetate in the eluent, you can exploit the difference in polarity between the two compounds. Isobutanol, being more polar, will elute later than isobutyl oleate.