How could spectroscopy be used to support that the below reaction occurred? Choose all that apply. Nac=CH DMSO CH 2nd attempt Choose one or more: O Use IR; the product has a strong broad peak at 2200 cm-1, but the starting material does not. O Uv-vis will not be useful as no change in Amax would occur. O Use IR; the starting material has a sharp narrow peak at 3300 cm-1, but the product does not. Use IR; the product has a sharp narrow peak at 3300 cm-1, but the starting material does not. O IR will not be useful as no detectable change in the spectrum will occur. O Use UV-vis; the product would show an absorbance at a shorter Amax from that of the starting material O Use IR; the starting material has a strong broad peak at 2200 cm-1, but the product does not. O Use UV-vis; the product would show an absorbance at a longer Amax from that of the starting material.

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Assigning Spectra: The peak at 0.9 ppm is a doublet, integrating to 6. Assign this peak to a fragment (Which statement is most correct?) * 20 10 ppm R2-CH-CH2-C(=0)-OR. Based on shift it could be a CH2 near carbonyl, with one neighboring proton. R2-CH-CH3. Could be a standard methyl, with one neighboring proton. O R-CH2-CH3. Could be a standard R-CH3, with 2 neighboring protons. RO-CH(R)-CH3. Could be standard methyl, with beta substituent, and one neighboring proton.

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A compound and its ¹H-NMR spectrum are shown below. Assign peak 1 and peak 2 in the spectrum to the hydrogen(s) labeled in red. i. a H3C- 10 C4H8O₂ Compound C b c -O—CH,CH3 2006 Brooks/Cole Thomson Submit Answer C 9 ↑ Which labeled hydrogen(s) correspond to each peak? peak 1: peak 2: 8 7 6 2H 5 Chemical Shift (8) Peak 3 Retry Entire Group 6 more group attempts remaining 3. 3H Peak 2 3H Peak 1 0 ppm

5. The proxluct of the reaction below gives the IR spectrum shown. Although you are unfamiliar with the rcaction, usc your knowledge of IR spectroscopy to predict a likely product. (Note: the number of carbon atoms in the product is the same as in the starting material.) Page 4 OH Al(OiPr)3 acetone no 4000 c hle belveen sall rlate cas. e Ged LIFE

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