Final W09 Key

Therearenosplittingpatternsin13cnmrspectroscopythereas

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Unformatted text preview: As wavenumber decreases a. Intensity increases b. Intensity decreases c. Energy Increases d. Energy Decreases e. None of the above 63. When observing IR spectroscopy of tertiary alcohols, what will be observed? a. A very broad OH stretch from 3650‐3550 b. A sharp peak at around 1715 c. A sharp to medium peak at 3400 d. A broad stretch at around 1715 e. None of the above 64. How does conjugation affect the wavenumber of a stretch in the IR? a. Decreases by 10 b. Decreases by 20 c. Increases by 10 d. Increases by 20 b. c. d. e. e. None of the above Consider the following structures: 65. Which molecule above has an absorption in the IR at 2220? [B] 66. Which molecule above has two absorptions at 3320 and 3250? [C] 67. Which molecule above has a strong and broad absorption at 3400? [A] 68. Which molecule has a strong absorption at 1250? [E] 69. Which molecule has a strong absorption at 1690? [D] Match the following structures to their IR spectra: 70. B 71. E 72. A 73. D C 1H NMR Spectroscopy 75. NMR relies on the principle that a nucleus has a spin greater than zero. Which of the following nuclei cannot be seen using NMR? a. 1H b. 2H c. 16O d. 19F e. None of the above 76. What is responsible for an alkene proton appearing so far downfield at 5‐7 ppm? a. Hydrogen and carbon are electron withdrawing b. Anisotropy c. Magnetic field d...
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