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23-RMX and RLi are valuable in synthesis a b-Nucleophile a-Electophile e-Oxidation reagent d-Reduction agent

23-RMX and RLi are valuable in synthesis a b-Nucleophile a-Electophile e-Oxidation reagent d-Reduction agent

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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23-RMEX and RLi are valuable in synthesis as -Electophile b-Nucleophile c-Oxidation reagent d-Reduction agent 24. Which one of the following statements about the mass spectrum of CH3Br is correct? a-theres just one peak for the molecular ion with an m/z value of 44 b-the last two peaks have abundances in the ratio 3:1 and occur at m/z values of 94 and 96. e-theres just one peak for the molecular ion with an m/z value of 95. d-the last two peaks are of equal size and occur at m/z values of 94 and 96. 25 To check that a secondary alcohol has been completely oxidized to a ketone you can... a-check that the IR spectrum has no absorption around 3500cm-1 b-check that the IR spectrum has no absorption around 1650cm-1 c-check that the IR spectrum no absorptions at 3500cm-1 and 1650cm-1 d-check that the IR spectrum has absorptions at 3500cm-1 and 1650cm-1 26-A simulation of the isotopic pattern for the parent peak in the mass spectrum of acetonitrile (CH3CN) gives peaks at m/z - 41, 42 and 43 with relative intensities 100.00: 2.65:002. An experimental mass spectrum shows intense or relatively intense peaks at m/z -38, 39, 40 and 41. What is the likely reason for the difference between the two sets of data? a-In the mass spectrometer, C-H bond cleavage occurs. b-In the mass spectrometer, C-C bond cleavage occurs. e-The simulation of an isotopic distribution pattern for a molecule is unreliable. d-In the mass spectrometer, C-N bond cleavage occurs. 27.Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed? a) Alphe particles b) Neutrons c) Electrons d) Protons 28. A molecule known to contain 3 nitrogen atoms is analyzed by EI-MS. Which of the following statements arises from the nitrogen rule? a-The molecular ion will have an even-numbered monoisotopic mass. b-All fragment ions will contain 3 nitrogen atoms. C-The molecular ion will have an odd-numbered monoisotopic mass. D-The molecular ion will be the base peak. Josh
Transcribed Image Text:23-RMEX and RLi are valuable in synthesis as -Electophile b-Nucleophile c-Oxidation reagent d-Reduction agent 24. Which one of the following statements about the mass spectrum of CH3Br is correct? a-theres just one peak for the molecular ion with an m/z value of 44 b-the last two peaks have abundances in the ratio 3:1 and occur at m/z values of 94 and 96. e-theres just one peak for the molecular ion with an m/z value of 95. d-the last two peaks are of equal size and occur at m/z values of 94 and 96. 25 To check that a secondary alcohol has been completely oxidized to a ketone you can... a-check that the IR spectrum has no absorption around 3500cm-1 b-check that the IR spectrum has no absorption around 1650cm-1 c-check that the IR spectrum no absorptions at 3500cm-1 and 1650cm-1 d-check that the IR spectrum has absorptions at 3500cm-1 and 1650cm-1 26-A simulation of the isotopic pattern for the parent peak in the mass spectrum of acetonitrile (CH3CN) gives peaks at m/z - 41, 42 and 43 with relative intensities 100.00: 2.65:002. An experimental mass spectrum shows intense or relatively intense peaks at m/z -38, 39, 40 and 41. What is the likely reason for the difference between the two sets of data? a-In the mass spectrometer, C-H bond cleavage occurs. b-In the mass spectrometer, C-C bond cleavage occurs. e-The simulation of an isotopic distribution pattern for a molecule is unreliable. d-In the mass spectrometer, C-N bond cleavage occurs. 27.Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed? a) Alphe particles b) Neutrons c) Electrons d) Protons 28. A molecule known to contain 3 nitrogen atoms is analyzed by EI-MS. Which of the following statements arises from the nitrogen rule? a-The molecular ion will have an even-numbered monoisotopic mass. b-All fragment ions will contain 3 nitrogen atoms. C-The molecular ion will have an odd-numbered monoisotopic mass. D-The molecular ion will be the base peak. Josh
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