?? ??? ??? Geometric Isomers differ in arrangement about a double bond. ??? ??? ??? Enantiomers isomers that are mirror images of each other. ??? ??? ??? Hydroxyl the monovalent group -OH in such compounds as bases and some acids and alcohols. polar-electronegative oxygen. attracts water molecules helping dissolve organic compounds. ??? ??? ??? Carbonyl C=O