14C_s10_finalA_key

14C_s10_finalA_key - Chemistry 14C Spring 2010 Final Exam...

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Chemistry 14C Spring 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 final course grade cutoffs, consult the grading scale on the Chem 14C course web page. 1. (a) OH OH CH 3 SH 182 o C 161 o C 101 o C 158 o C (b) CH 3 O OCH 3 HO OCH 3 HO OH OH HO 102 o C 166 o C 239 o C 210 o C (c) 80 o C 218 o C 49 o C 177 o C 2. Aromatic stacking and London forces. 3. F C F F O C F F H or F C F F C H F O F Hydrogen bonding has been removed, so the boiling point is lower . 4. NH 2 This isomer has the maximum number of hydrogen bonding possibilities, and the greatest possible surface area . 5. H 2 N NH 2 O NH 2 Cl Cl H H O Nitrogen lone pair density (and hence ability to accept a hydrogen bond) is less at the amide nitrogen (due to resonance) and the Cl
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This note was uploaded on 09/06/2011 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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14C_s10_finalA_key - Chemistry 14C Spring 2010 Final Exam...

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