FinalExamPractice

FinalExamPractice - 3. Describe the splitting expected for...

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1. Determine if each of the sets of protons listed below are chemically equivalent or magnetically equivalent. Fill in each blank with “yes” or “no.” Are protons B and C chemically equivalent? _______ Are protons A and B chemically equivalent? __________ Are protons B and C magnetically equivalent? __________ Are protons A and B magnetically equivalent? _________ Are protons E and G chemically equivalent? _______ Are protons F and H chemically equivalent? __________ Are protons E and G magnetically equivalent? __________ Are protons F and H magnetically equivalent? _________ 2. When Sample A (below) is run on a 100 MHz NMR, the proton spectrum is second order, but when it is run on a 500 MHz instrument, the spectrum is first order. Explain this difference, using the necessary calculations.
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Unformatted text preview: 3. Describe the splitting expected for the proton NMR signals of the indicated protons given these coupling constants: J AB = 10 Hz, J BC = 4 Hz, J AC = 1 Hz, J CD = 7 Hz. 4. Use a tree diagram to predict the splitting pattern of H A in the compound below. Draw the pattern to scale. Use the appropriate typical coupling constants given in the coupling constants tables. 5. What does IR stand for? What is IR spectroscopy especially good for when determining the structure of an unknown? 6. What is a mass spectral library, and for what is it used? 7. What is the purpose of an ionizer in the MS instrument? Give an example of one type of ionizer. What is the purpose of a mass analyzer in the MS instrument? Give an example of one type of mass analyzer....
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FinalExamPractice - 3. Describe the splitting expected for...

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