Unsaturated fatty acids show different types of isomerisms. We have already learnt about the.concept of isomerism in the last unit. You would realize that fatty acids with same molecular formula, as well as, same number of double bonds may differ in the location of double bonds and exhibit positional isomerism. Oleic acid has 15 different positional isomers. Again, the orientation of the two hydrogen atoms attached to the two carbon atoms joined by the double bonds may differ (geometric