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Questions asked by users might not always be phrased in the clearest way.
Isobutanol and isobutyl oleate have different polarities. Isobutanol is a polar alcohol, while isobutyl oleate is a non-polar ester. Therefore, a solvent that is highly polar (like water) would dissolve isobutanol but not isobutyl oleate. Conversely, a non-polar solvent (like hexane) would dissolve isobutyl oleate but not isobutanol.