In 13C NMR, carbon atoms with the lowest electron density have the largest chemical shift (largest ppm shift from 0). Identify the peaks labeled X, Y and Z in the 13C spectrum of butyl acetate as shown below. 200 not X 150 160 140 A. X is 1, Y is 2, Z is 3 B. X is 1, Y is 3, Z is 2 C. X is 2, Y is 1, Z is 3 Enter Your Answer: 120 OA OB 100 ppm OC 80 y 60 40 20 OD OE OF N 0 D. X is 2, Y is 3, Z is 1 E. X is 3, Y is 1; Z is 2 F. X is 3, Y is 2, Z is 1

Predict the approximate chemical shift of the indicated peaks in the C-NMR spectrum.

A researcher is studying cytochrome oxidase, a protein that uses iron to bind diatomic oxygen. She collects two IR spectra, shown below. In the first spectrum, no isotopic labeling is used (top). In the second, 10 has been replaced with 180 (bottom). 820 655 790 0.5- 714 695 733 820 655 755 0.5- 714 695 733 0+ 600 650 700 750 800 850 Vo (cm") Based on the above ratio, which is the most likely source of this vibration, (a) the Fe-O stretch in Fel-O=0, or (b) the O-O stretch in Fel"-O=O? You can assume that the atomic weight of Fe is 56. ww n wwm % Transmission

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Which underlined proton (or sets of protons) has the greater chemical shift (that is, the higher frequency signal)?

Predict the approximate chemical shift of the indicated peaks in the C-NMR spectrum.

Using the following spectra and other information provided, identify the compounds, and all pertinent peaks are assigned in the spectra (correct compound, labeling proton spectrum, labeling carbon spectrum) Label the peaks on the spectrum and place the structure of the compound in the box on the right side of the spectrum.

The following is the 1H-NMR of the given structure with the different NMR peaks highlighted. Match the NMR peaks with the groups of Hs on the structure.

Using the following spectra and other information provided, identify the compounds, and all pertinent peaks are assigned in the spectra (correct compound, labeling proton spectrum, labeling carbon spectrum) Label the peaks on the spectrum and place the structure of the compound in the box on the right side of the spectrum.

24) Draw 'H NMR for the following compound on the chemical shift scale in H NMR spectra below. Show multiplicity of each signal (and also label each signal as s,d,t,q,etc.). Show integration number next to each signal. Use the 'H NMR Chemical shifts table for approximate chemical shifts. chemical shift scate: w 10 8 g 4 6 5 Chemical Shift (ppm) 3 2 0