Oleic acid and elaidic acid are isomeric alkenes:

Oleic acid, a major component of butter fat, is a colorless liquid at room temperature. Elaidic acid, a major component of partially hydrogenated vegetable oils, is a white solid at room temperature. Oleic acid and elaidic acid can both be prepared in the laboratory by reduction of an alkyne called stearolic acid. Draw the structure of stearolic acid, and identify the reagents you would use to convert stearolic acid into oleic acid or elaidic acid.

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ОН Oleic acid ОН Elaidic acid