Exam 3FS07 - CEM 351, Fall 2007 Midterm Exam 3, Version A...

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CEM 351, Fall 2007 Midterm Exam 3, Version A Monday, November 19, 2007 1:50 – 2:40 p.m. Room 138, Chemistry Name (print) Signature Student # Section Number (2 pts extra credit) Grade? . 1.(25 pts.) . 2.(25 pts.) . 3.(25 pts.) . 4.(25 pts.) . 5.(25 pts.) TOTAL (100 pts.) Score Note : Be sure to completely read all questions before beginning the exam . Answer any 4 questions for a total score of 100 pts, then please mark the four we are to grade by checking their boxes; otherwise, the first four graded=your score! Recitation Day and Time Instructors: Room 1. T 9:10-10:00 a.m. Alex Predeus 85 2. M 10:20-11:10 a.m. Alex Predeus 281 3. T 10:20-11:10 a.m. Karrie Manes 85 4. Th 10:20-11:10 a.m. Kostas Rampalokos 287 5. T 10:20-11:10 a.m. Alex Predeus 283 6. T 11:30-12:20 p.m. Kostas Rampalakos 283 7. Th 11:30 - 12:20 Kostas Rampalakos 85 8. M 4:10-5:00 p.m. Karrie Manes 110 9. W 4:10-5:00 p.m. Karrie Manes 110 So…so you think you can tell Heaven from hell Blue sky from pain. Can you tell a green field From a cold steel rail? A smile from a veil? Do you think you can tell…? --Pink Floyd
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2 1. (25 pts) Acidity and the reactions of alcohols and amines. a. (8 pts) We have learned that leaving group ability tracks with the pKa of the conjugate acid. On these grounds, the following two similar reactions are both solidly favorable. But only the first works; the second fails completely. Why? Briefly explain in words and equations (Hint: what else can these partners do?). pKa values: CH 3 OH 2 + –2.2 (CH 3 ) 2 OH + –3.8 CH 3 NH 3 + +10.6 CH 3 NH 2 + CH 3 O(CH 3 ) 2 + (CH 3 ) 2 NH 2 + + (CH 3 ) 2 O Works great! CH 3 NH 2 + CH 3 OH 2 + (CH 3 ) 2 NH 2 + + H 2 O Fails to go this way!
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This note was uploaded on 02/17/2012 for the course MTH 133 taught by Professor Staff during the Fall '08 term at Michigan State University.

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Exam 3FS07 - CEM 351, Fall 2007 Midterm Exam 3, Version A...

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