MU, Chemistry 8160 - Organic Spectroscopy - Fall 2010
NUMBER OF TESTS TAKEN: 13 enrolled, 1 auditing E1Q1 E1Q2 E1Q3 E1Q4 EXAM1 E1-Score Maximal Possible 20.0 20.0 20.0 40.0 100.0 60.0 Average 16.7 13.8 15.1 16.3 61.8 75.9 Standard Deviation 1.7 2.8 6.9 9.7 12.9 13.9 Minimum 14.0 10.0 0.0 6.0 36.0 43.3 Maximum 20.0 19.0 20.0 40.0 86.0 93.3 Q1 - Q3 worked fine. One student overlooked Q3 altogether and hence the low minimum for Q3. Q4 turned out to be more of a challenge than expected. The molecular formula was not given and that provided a lot of problems. Two key insights to solve Q4: (a) The NMR shows two clearly separate signals and two more overlapping signals. There are only 4 types of H. The chemical shift analysis shows that one signal comes from a CHn group attached to an O. (b) The IR "yells" ester (and excludes alcohols, acids, amines, imines, nitriles). Remember that E#1 is the "IR Test". One more comment on the IR: Note that there are TWO bands in the C=O region. The two C=O stretches are coupled and we see the asymmetric and symmetric modes separated by about 20 cm-1. Since the average on Q4 was below 50%, Q4 was dropped and the exam #1 score is the percentage score of Q1 - Q3.