Chapter 10practiceA

Chapter 10practiceA - 1 In nuclear magnetic resonance...

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1. In nuclear magnetic resonance, stronger magnetic fields A) give a higher sensitivity spectrum than do lower magnetic fields. B) give different chemical shifts (in ppm) than would weaker magnets. C) give better separation between peaks in the spectrum (in Hz) than would weaker magnets. D) give different coupling constants than would be observed with weaker magnetic fields. E) Both A and C are true. Ans: E 2. Which of the following structures of formula C 8 H 8 Br 2 would give the NMR spectrum shown below? A) CH CH 2 Br Br B) Br CH CH 3 Br C) Br CH 2 CHBr 2 D) Br CH CH 3 Br E) Page 1
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Br CH 2 CH 2 Br Ans: D 3. The type of electromagnetic energy required to cause nuclear magnetic resonance is 4. Which of the following structures C 5 H 12 O would give the NMR spectrum shown? H 3 C CH 2 CH 2 CH 2 CH 2 OH H 3 C CH 2 CH CH 2 CH 3 OH H 3 C CH 2 CH 2 CH CH 3 OH CH 3 CH 3 CH CH CH 3 OH CH 3 CH 3 CH CH 2 CH 2 OH 5. Which of the following is not true of 13 C NMR? Page 2
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6. How many different types of hydrogens are present in the following molecule? H 3 C CH CH CH Br Br CH 3 Br A) three B) four C) five D) six E) seven Ans: A 7. The CH 2 group indicated would most likely appear as what in the proton NMR spectrum? 8. How many different types of carbon would be present in the following molecule? CH 3 CH 3
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