14D_w10_finalB_key

14D_w10_finalB_key - Chemistry 14D Winter 2010 Final Exam...

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Chemistry 14D Winter 2010 Final Exam Part B Solutions Page 1 Statistics : High score, average and low score will be posted on the course web site after exam grading is complete. The exam is ready to be picked up (or mailed out if you gave an envelope) when these numbers are posted. A note about exam keys : The answers presented here are usually significantly longer than expected from a student taking the exam. An exam key serves not only to reveal what was expected, but to instruct you as well. To see the final course grade cutoffs, consult the grading scale on the Chem 14D course web page. 1. An atom or group of atoms that departs from the rest of the molecule, taking with it the pair of electrons that used to be the bond between the leaving group and the rest of the molecule. 2. Good 3. Feature #1 : Diphosphate ion is a good leaving group because, upon departure, it gains resonance delocalization (with subsequent stabilization) of the negative charge. O P O OH O P O OH OH O P O OH O P O OH OH Reason #2 : The multitude of oxygens (with their high electronegativity) further delocalizes the negative formal charge by electron-withdrawing inductive effects. 4.
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This note was uploaded on 03/12/2012 for the course CHEM 14D taught by Professor Hardinger during the Winter '08 term at UCLA.

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14D_w10_finalB_key - Chemistry 14D Winter 2010 Final Exam...

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