CHEM 239 exam_answers_Exam_2_Answers

CHEM 239 exam_answers_Exam_2_Answers - Page...

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1 Page 1_______2_______3_______4_______5_______TOTAL________/100 CHEM 237, FALL 2007 HOUR EXAM 2 Name________________________________________________________ TA Name (1 pt)___________________ __& Section # (1pt)_____________ Student #______________________________________________________ **DO NOT TURN IN YOUR EXAM UNTIL THE END OF THE PERIOD. IT IS DISRUPTIVE TO THOSE WHO AREN’T YET DONE** 1. (8 pts) Label the following structures as cis or trans . Draw a circle around the most stable compound and a square around the least stable compound. 2. (10 pts.) Draw ALL the tribromocyclopropane isomers. trans cis cis cis trans trans CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3
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2 3. (10pts) Sketch curves on the graph below showing the energy changes that arise from rotation about the C2-C3 bond of 2,3-dimethylbutane. You need not concern yourself with actual numerical values of the energy changes, but you should label all maxima and minima on the Newman skeletons provided with appropriate -CH 3 or -H groups (for simplicity, and so that the
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This note was uploaded on 06/29/2008 for the course CHEM 239 taught by Professor Sasaki during the Winter '06 term at University of Washington.

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CHEM 239 exam_answers_Exam_2_Answers - Page...

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