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Isobutyl oleate, being an ester, is more likely to be soluble in diethyl ether than in n-heptane. Diethyl ether is a polar aprotic solvent, while n-heptane is a non-polar solvent. 'Like dissolves like' is a general rule of thumb in chemistry, meaning polar substances tend to dissolve in polar solvents, and non-polar substances tend to dissolve in non-polar solvents. Isobutyl oleate, with its polar ester group, will have greater solubility in the polar diethyl ether.