2011Exam1Key - CHEMISTRY 261 Exam 1 Dr. Alexanian September...

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CHEMISTRY 261 Name_. .::. ..\(.=-. ..;:{;'--'--C- _________ Exam 1 Dr. Alexanian Pledge: I have neither given nor received aid on this exam. September 23. 2011 1. Nomenclature (9 points) Either give the IUPAC name for compounds or provide the structure for the indicated name. Indicate R, S, cis, trans, where appropriate. a. b. c. ,Br .$' C\CI ~ ,. L _ '" c.lJ roc. .,c.\·\r."",~ ... C2. . ( l!-~.<.:~s.J"" gre __ . . ",.- [S):1-chloro-3-methylpentane 2. Write valid Lewis structures for the following species. Show all non bonding (unshared) electrons and indicate any formal charges. (8 points). . . . 0 . H)~H 3. Explain why the following compound is not stable. (6 points) -\-,. .. ~ 't \- \:. .... l -.-, \to . ...... .\ 0........ , \.... ~ \ Loe>,- ~-4t. . 4-0 r;"j. 4. Label the following as chiral or achiral. (2 pOints each) 1
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5. Draw the two chair conformations of cis-1 ,3-dimethylcyclohexane. One of these chair conformations is more stable by 5.4 kcal/mol. Given that a 1 ,3-diaxial interaction between a CH
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This note was uploaded on 02/05/2012 for the course CHEM 261 taught by Professor Alexanian during the Spring '11 term at University of North Carolina School of the Arts.

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2011Exam1Key - CHEMISTRY 261 Exam 1 Dr. Alexanian September...

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