C251_Lab_Final_Comp___05_ - NAME:_ Lab Day M T W Th F Last...

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NAME:____________________________________________ Lab Day M T W Th F Last First Morning Afternoon (Please Circle) Cornell University Chemistry 251 Spring 2005 Final Examination April 28, 2005 Instructions: Read all questions completely before answering. If the question is still unclear, be sure to ask for clarification. You may find it helpful to first answer those questions that you find easier and then return to those you find more difficult. Good Luck and have a nice break!!! Problem Score Possible 1 35 2 10 3 30 4 20 5 15 6 30 7 10 8 20 9 20 10 30 11 30 12 20 13 30 Total 300 Signature:____________________________________________
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Page 1 of 8 1) ( 35 pts total) a) Propose a reasonable mechanism to account for the following reaction that you performed in lab. Br 2 + 2 Mg + O O OH 2) H 3 O + O b) When Sue Student performed the above reaction, she observed the following compound in her final product mixture. Propose a mechanism for the reaction that must have generated this unexpected product. Sue Student's Unexpected Product
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2) ( 10 pts) In Question 1b (page 1), Sue Student generated the unexpected product and she wants advice from you on how to minimize the generation of this unexpected product. What would you tell her to do, experimentally, to minimize the formation of this product? 3) ( 30 pts) Snoop Dog, prior to his Slope Day appearance, came into lab and tried to run the reaction shown in question 1a (page 1). Snoop didn’t really know the names of the solvents and he chose another solvent for the reaction. The reaction he ran is shown below with his choice of solvent. He was sad when he generated a different product. Propose a mechanism to account for Snoop’s reaction
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C251_Lab_Final_Comp___05_ - NAME:_ Lab Day M T W Th F Last...

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