CH235F06EII - CH 235 Fall 2006 Name SS Exam I This exam is...

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CH 235 Fall 2006 Exam I October 12, 2006 Name________________________ SS#_________________________ This exam is divided up into three parts; multiple choice, short answer, and problems. Answer all questions in pencil, not ink. All work must be shown in order to receive full credit. No cell phones, beepers, PDAs, or other electronic devices are permitted in the lecture hall during the exam. Any acts of dishonesty will result in expulsion from the exam and a grade of zero. Multiple Choice. Choose one correct answer and record it on the scantron provided. (45 pts) 1. Which one of the following structures represents the lowest energy conformation? Cl H 3 C Cl CH 3 CH 3 Cl Cl CH 3 CH 3 Cl a) b) c) d) e) 2. In which of the following cyclohexane molecules do the substituents in the more stable conformation have a diequitorial relationship? a) cis-1,2 disubstituted b) cis-1,3 disubstituted c) trans-1,3 disubstituted d) cis-1,4 disubstituted e) None of the above. 3. Which of the following correctly lists the conformations of cyclohexane in order of increasing energy? a) chair < boat < twist-boat < half-chair b) half-chair < boat < twist-boat < chair c) chair < twist-boat < half-chair < boat d) chair < twist-boat < boat < half-chair e) half-chair < twist-boat < boat < chair
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CH235F06EII - CH 235 Fall 2006 Name SS Exam I This exam is...

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