Quiz Bank 7

Quiz Bank 7 - 1 Quiz Bank 7 H and 13C NMR 1 What are the 4 types of information that NMR tells us 2 Signals in the 1H NMR dont always show up as a

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Quiz Bank 7 1 H and 13 C NMR 1. What are the 4 types of information that NMR tells us? 2. Signals in the 1 H NMR don’t always show up as a single peak. What is this phenomenon? 3. What do the integration values (area underneath each peak) correlate to? 4. Sometimes the integration values are not always perfect. Give an explanation for this. 5. Draw a molecule that has methyl, methylene, and methane protons on it. 6. Why is the NMR scale in chemical shift values ( δ ) and not in Hz? 7. A spectra was taken on a 400 MHz NMR that showed a doublet at 2500 Hz. What is the chemical shift value in ppm of this peak? 8. What influences the chemical shift value? 9. A bromine atom adjacent to a proton greatly affects the chemical shift. What happens if the bromine is placed 1 or two carbons away? 10. Describe what happens to the chemical shift value of the adjacent proton, in terms of electronegativity and deshielding effects, when you exchange an Iodine for a Fluorine.
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This note was uploaded on 04/09/2010 for the course CHEM 6a taught by Professor Pettus during the Winter '07 term at UCSB.

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Quiz Bank 7 - 1 Quiz Bank 7 H and 13C NMR 1 What are the 4 types of information that NMR tells us 2 Signals in the 1H NMR dont always show up as a

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