14D_f10_finalA_key

14D_f10_finalA_key - Chemistry 14D Fall 2010 Final Exam...

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Chemistry 14D Fall 2010 Final Exam Part A 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 when these numbers are posted. A note about exam keys : The answers presented here may be 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 projected course grade cutoffs, consult the grading scale on the Chem 14D course web page. The final grade cutoffs cannot be determined until after the final exam has been graded. 1. Resonance stability of the carbonyl compounds on both sides of the equilibrium is the major determining factor. (a) K eq ~ 1 (b) K e q > 1 (c) K e q > 1 2. Faster reaction: H O H 2 O OH OH This is the faster reaction because an aldehyde carbonyl presents less steric hindrance to nucleophilic attack than a ketone carbonyl. --or-- This is the faster reaction because an ethyl group is an electron-donor and a hydrogen atom is not, so a ketone carbonyl has a smaller δ + on its carbon atom than does an aldehyde. 3.
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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_f10_finalA_key - Chemistry 14D Fall 2010 Final Exam...

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