Exam 2 1998

Exam 2 1998 - Name: CHEMISTRY 3311, Fall 1998 Professor...

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Name: -1- CHEMISTRY 3311, Fall 1998 Professor Walba Second Hour Exam October 22, 1998 scores: 1) 2) 3) 4) PLEASE read the questions carefully! H 1 He 2 Li 3 Be 4 B 5 C 6 N 7 O 8 F 9 Ne 10 1A 2A 3A 4A 5A 6A 7A 8A Partial Periodic Table Na 11 Mg 12 Al 13 Si 14 P 15 S 16 Cl 17 Ar 18 Br 35 I 53 This is a closed-book "open model" exam. You may use models, but no notes or books. Please put all your answers on the test. Use the backs of the pages for scratch.
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Name: -2- 1) (30 pts) For the following substituted cyclohexane isomers, carefully draw the two possible chair conformations for each isomer (that means you should have four perspective chair structures drawn, two equilibrating structures in each box). Of course you need to put the methyl and tert-butyl groups on the structures, but please do not put in the H atoms. For each pair of conformations, circle the more stable one. If the two conformations have the same energy, label that pair “same”.
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Name: -3- 1 -continued- b) The same isomers from part a) are reproduced below. Circle the more stable compound below.
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Exam 2 1998 - Name: CHEMISTRY 3311, Fall 1998 Professor...

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