Quiz(3) - Name: TA: Answer the following questions. There...

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Name: TA: Answer the following questions. There is more than one answer for questions that are starred *** (bubble in all correct answers). 1 H NMR, 13 C NMR, UV-Visible Spectroscopy, and Polarimetry Quiz 1 H NMR 1. Integration reveals information about: a. the number of coupling constants b. the number of protons c. the number of neighboring heteroatoms d. the number of splitting patterns 2. A shielded proton (an electron rich proton) will have a chemical shift that is: a. leftfield b. rightfield c. upfield d. downfield 3. Which of the following is used to establish the standard of scale for deuterated solvents? a. CDCl 3 b. C 6 D 6 c. (CD 3 ) 4 Si d. CCl 4 4. Absorption of radiofrequency causes what to flip in a molecule? a. groups of atoms b. functional groups c. momentum of spin for a particular nuclei d. stealth character 5. For a nucleus with a spin of ± 1/2, how many allowed orientations of the nucleus are there when placed in a magnetic field? a. 1 b. 2 c. 3 d. 4 6. Which of the following nuclei environments undergoes transition at a higher applied magnetic field (upfield)? a. electron rich environments b. electron poor environments c. conjugated π -system environments d. none of these 7. The chemical shift of a free hydroxyl proton is not concentration dependent? a. True b. False
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***8. What information does coupling give in 1 H NMR? a. integration b. the number of adjacent protons c. the angle relative to the observed proton d. the number of protons at the observed frequency ***9. Which of the following facts are true about π -electrons when compared to σ -bond electrons? a. they perturb nearby nuclei b. they don't absorb radiofrequency c. they cancel the out the magnetic field d. they are more polarizable 10. In benzene, the electron cloud above and below the plane of the ring generates
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This note was uploaded on 04/21/2010 for the course CHEM Chem 6BL taught by Professor Pettus during the Fall '05 term at UCSB.

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Quiz(3) - Name: TA: Answer the following questions. There...

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