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fallquiz32009 - Name Last First(PLEASE PRINT CLEARLY...

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Name:______________________________ Last, First (PLEASE PRINT CLEARLY ) 1 CHEMISTRY 8A Fall 2009 Midterm Quiz 3 November 25, 2009 Professor Sheila S. David 1. ( 20 points) 2. ( 8 points) 3. (12 points) 4. ( 6 points) 5. ( 6 points) 6. ( 12 points) 7. ( 18 points) 8. (14 points) 9. ( 14 points) Total ( 110 points) Extra Credit ( 10 points) For students to read at exam time: Closed book and notes. Please read exam carefully. Partial credit may be awarded if you show your work. For students to read after exam is returned: If you have any problems with the grading of a question, return your exam to Dr. David/TAs by Dec. 7 with a note attached indicating which problems should be regarded and a brief explanation. Regrades will not be accepted after Dec. 7. Student ID Number: _____________________________ ID Check
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Name:______________________________ Last, First (PLEASE PRINT CLEARLY ) 2 1. (20 pts/4 pts each) Appetizers/ Multiple Choice—Put answer in the box at the right (i) For the following pair of compounds, which compound has a more nucleophilic nitrogen? H 3 C N O H H 3 C N H vs A B (ii) Indicate which of the carbocations in the following pair is more stable . CH 2 CH 3 vs A B (iii) Which of the following correctly describes intermediates and/or transition states? A) Transition states occur at minima on reaction coordinate diagrams B) Both transition states and intermediates occur at maxima on reaction coordinate diagrams C) Transition states have partially formed bonds whereas intermediates have fully formed bonds D) none of the above (iv)
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