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Isobutyl oleate, being a fatty ester, is more soluble in diethyl ether than in n-heptane. This is because diethyl ether is a polar aprotic solvent, while n-heptane is a nonpolar solvent. The polar nature of diethyl ether allows it to interact with the polar ester group in isobutyl oleate, promoting solubility. In contrast, n-heptane's nonpolar nature leads to weaker interactions with the isobutyl oleate molecule, resulting in lower solubility.