This supplementary problems book, to be used in conjunction with a molecular orbital theory textbook at the senior, first-year graduate level in chemistry courses, is written by leading authorities in molecular orbital theory research and teaching. The text will be useful for courses in advanced inorganic, physical organic, and group theory. Because many different compounds are presented, the instructor can develop a "personalized course" by selecting problems from a variety of research interests. Carefully worked out solutions, including a large number of informal diagrams, are provided for all questions and problems. In addition to its practical use for courses, this textbook will also be of interest to individual chemists who want to upgrade their knowledge of molecular orbital theory.