Exam 3 FS10 - CEM 351, Fall 2010 Midterm Exam 3 version A...

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CEM 351, Fall 2010 Midterm Exam 3 version A Monday, November 22, 2010 1:50 – 2:40 p.m. Room 138, Chemistry Name (print) Tur-KEY Time Signature Student # Section Number Grade this question? YES NO! . . 1.(20 pts.) . . 2.(20 pts.) . . 3.(20 pts.) . . 4.(20 pts.) . . 5.(20 pts.) . . 6.(20 pts.) TOTAL (100 pts.) Score Note : Answer any 5 questions for a total score of 100 pts. Be sure to look over all questions before beginning the exam. Then check the boxes that signify which five questions should be graded, or the first 5 graded = your score! Recitation Day and Time Instructors: Room 1. T 9:10-10:00 a.m. Jason Lam 85 2. M 10:20-11:10 a.m. Carmin Burrell 281 3. T 10:20-11:10 a.m. Carmin Burrell 85 4. Th 10:20-11:10 a.m. Arvind Jaganathan 287 5. T 10:20-11:10 a.m. Jason Lam 283 6. T 11:30-12:20 p.m. Jason Lam 283 7. Th 11:30 - 12:20 Arvind Jaganathan 85 8. M 4:10-5:00 p.m. Carmin Burrell 110 9. Th 4:10-5:00 p.m. Arvind Jaganathan 183
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2 1. (20 pts) (4 pts each) For each set of isomeric structures in the grid below, circle the one fitting the description (2 pts) at the right, and provide a brief explanation (2 pts). If you need more space, continue below (e.g. if you need to draw additional structures, etc.) Most stable cation Enjoys best resonance structures including one w/ a tertiary cation O O OH Cyclic ether The second one is an ether but isn ʼ t cyclic; The third one is a cyclic alcohol. Br Br Br Best C 5 H 11 Br substrate for S N 2 reaction Primary bromide with the least steric blockage near the approach to the backside of the C-Br bond. H N H N N H C 6 H 15 N amine with fewest 13 C NMR peaks The two isopropyl groups are equivalent and only have the CH and CH3 carbons, so diisopropylamine shows only two 13 C resonances.
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Exam 3 FS10 - CEM 351, Fall 2010 Midterm Exam 3 version A...

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