Sample Exam3,2521-F07 - 1 Chemistry 2521 Fall Semester 2007...

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1 Chemistry 2521 Fall Semester 2007; Midterm 3 Exam December 7, Friday, 1:00 to 1:50 pm This exam has 7 problems (100 pts) on 9 pages. Make sure your copy is complete and correct. Printed Name ( Last , First) ______________________________________________________ Your graded exams will be available Monday, December 10, before class. Good Luck!
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2 Chemistry 2521 Fall 2007; Midterm 3 Exam This exam has 7 problems on 9 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._______________ Total: ____________
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3 1. (10) Using provided boxes, answer the questions on mechanism of the following reaction: light (h ! ) Br 2 + Br + HBr Using the "fishhook" arrows write the initiation step in the reaction mechanism (2 pts): light (h ! ) Br Br 2Br• Using the "fishhook" arrows, write the two chain propagation steps in the reaction mechanism (6 pts): •Br + •Br allyl radical + HBr Br Br Br H (3 pts for arrows) (3 pts for arrows) Using "fishhook" arrows and showing the structure of the second resonance contributor, show resonance stabilization for the allyl radical (2 pts): resonance contributor (1 pt) allyl radical (1 pt for arrows)
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