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Sample Final,2521-F07 - 1 Chemistry 2521 Fall Semester 2007...

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1 Chemistry 2521 Fall Semester 2007; Final Exam December 17, Monday, 4:00 to 5:55 pm This exam has 8 problems (200 pts) on 11 pages. Make sure your copy is complete and correct. Printed Name ( Last , First) ______________________________________________________ Your final grades will be posted on the web Tuesday morning. Please pick up your graded exams from 11:00 to 12:00 and 2:00 to 4:00 pm on Tuesday, December 18, in room Chem 319. You must report any grading errors by 11:00 am Wednesday, December 19. No grade change will be possible after this time. Good Luck!
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2 Chemistry 2521 Fall 2007; Final Exam This exam has 8 problems on 11 pages. Make sure your copy is complete and correct. Printed Name (Last, First) __________________________________________________ Scores: Problem 1:_______________ Problem 2:_______________ Problem 3._______________ Problem 4._______________ Problem 5._______________ Problem 6._______________ Problem 7._______________ Problem 8._______________ Total: ____________
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3 1. (15 pts) Answer the questions on mechanism of the following reaction: OTos acetone + NaSH CH 3 CH 3 SH + NaOTos a) Which of the following energy diagrams best represents the course of this reaction (circle the correct answer, 3 pts)? b) Circle the correct rate equation for this reaction (3 pts): Rate = k x [RTos] Rate = k x [RTos] x [acetone] Rate = k x [RTos] x [HS ] Rate = k x [acetone] x [HS ] c) Circle the nucleophile in this reaction (3 pts): Cl acetone CH 3 Na + Tos TosO HS d) Circle the leaving group in this reaction (3 pts): Cl acetone CH 3 Na + Tos TosO HS e) What type of mechanism this reaction has? (circle correct answer, 3 pts) S N 1 S N 2 E1 E2 E1cb radical substitution
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4 2. (20 pts) Answer the questions on mechanisms of the following reactions: Br CH 3 C 2 H 5 ONa C 2 H 5 OH CH 3 Reaction 1: a)
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