14C_f10_e01_key

14C_f10_e01_key - Chemistry 14C Fall 2010 Exam 1 Solutions...

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Chemistry 14C Fall 2010 Exam 1 Solutions Revised 10/26/10 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 14C course web page. 1. N N O H 3 C H O O O OH P O HO O Anomeric carbon 2. C 10 H 14 N 2 O 8 P The correct way to write the formula of an organic compound is carbons first, hydrogens next, then all remaining elements in alphabetical order . 3. Thymidine monophosphate has 19 lone pairs, 6 sp 3 carbon atoms, and 4 sp 2 carbon atoms. 4. O (3.5) > N (3.0) > C (2.5) > P (2.2) > H (2.1) 5. OH These atoms have the greatest difference in electronegativity . 6. β -D-2-deoxyribofuranose 7. (a) Furanose (b) β only 8. N N O H 3 C O H H N N O H 3 C O H H C D 9. The ranking depends upon which resonance contributors you drew. For contributors A D shown in the exam and this key,
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14C_f10_e01_key - Chemistry 14C Fall 2010 Exam 1 Solutions...

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