Self-Test Questions

Draw molecular structures of each of the isomers of difluorobenzene and identify all axes and mirror planes of symmetry for each case. 

Crystal symmetry is covered in several texts, including  

Senechal, M. (1990) Crystalline Symmetries An Informal Mathematical Introduction. Adam Hilger (ISBN 0-7503-0041-8). 

Franzen HF (1994) Physical Chemistry of Solids, Basic Principles of Symmetry and Stability of Crystalline Solids. World Scientific Publishing (ISBN 9-8102-1154-6). 

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Each set of self test questions consists of four questions. The first two are multiple choice questions offering four alternative answers to the question and you should select the correct answers. Any number of them or none of them might be correct. The last two questions each consist of two statements joined by the word BECAUSE. Consider each statement separately and decide whether it is true or false. If both questions are true, decide whether the whole sentence is true, i.e. does the second statement provide a correct explanation for the first statement. 

The self test questions are at the end of most sections in a box. The four questions are designed to test the reader s understanding of the basic principles of the topic without going into the details of the subject. There are two types of questions ... 

In addition, the Self-Test at the conclusion of each chapter is designed to test the student s mastery of the material. Both fill-in and multiple-choice questions have been included to truly test the student s understanding. Answers to the self-test questions may be found in Appendix A at the back... 

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