First Midterm key

First Midterm key - 1. The following figure represents a...

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1. The following figure represents a theoretica l 1 H NMR spectrum were all the peaks appear as singlets. a. (8 pt.) assign to each peak (on the line provided) a letter corresponding to the protons and the expected multiplicity (for example: proton g, (t). b. (2 pt.) what is the expected relative ratio of the individual lines of the peak at 3.19? (for example t, 1:2:1) ___ 1:6:15:20:15:6:1 _____________ 0 1 2 3 4 5 PPM O O a c d e b d (s) c (sep, 7 lines) e (s) a , b (d) 2. (6 pt.) The following compound was dissolved in dry solvent and the NMR spectra were recorded. OH HO a. a. How many signals will appear in the 1 H NMR spectrum? ____ 3 _______ b. How many signals will appear in the 13 C (decoupled) NMR spectrum? ____ 4 ______ c. What is the estimated chemical shift for the protons labeled with (a.)? Circle one: (0.5-1.5 ) 1.5-2.5 2.5-3.5 3.5-4.5 5.5-6.5 3. (6 pt.) You were asked to evaluate a computer program that is capable of predicting chemical shifts based on structure. Using your 140B knowledge, you decided to use the following molecule for the test. These are the predicted chemical shifts:
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f. 5.60
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First Midterm key - 1. The following figure represents a...

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