Review hw answers. Discuss structural and molecular formulas for a series of Benzene compounds. Introduce official IUPAC names as well as common chemical names and traditional names. Explain Alkynes bonding. Introduce functional organic group definition and explain the first group as the halogens. Examine the nomenclature by using examples, discuss physical property differences, isomers, and alcohols. From a number of structural formulas, derive the correct name, and vice versa