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In ¹H NMR, increased electron density in a C-H sigma bond causes A. Deshielding and an increased precessional frequency. B. Shielding and an increased precessional frequency. C. Deshielding and a decreased precessional frequency. D. Shielding and a decreased precessional frequency. A mass spectrum will show an M+2 peak molecular about 1/3 the intensity of the molecular peak if A. the molecule contains chlorine. B. the molecule contains an odd number of nitrogen atoms. C. the molecular ion is unstable. D. the molecule contains an even number of nitrogen atoms. E. the molecule contains bromine. Which of the following compounds would be expected to show a mass spectrum with a molecular ion having an odd mass-to-charge ratio? I. NH Br CI -Br H₂N NH2 III. IV. II. NH₂ A. I only B. II only C. III only D. IV only E. more than one of the above

In ¹H NMR, increased electron density in a C-H sigma bond causes A. Deshielding and an increased precessional frequency. B. Shielding and an increased precessional frequency. C. Deshielding and a decreased precessional frequency. D. Shielding and a decreased precessional frequency. A mass spectrum will show an M+2 peak molecular about 1/3 the intensity of the molecular peak if A. the molecule contains chlorine. B. the molecule contains an odd number of nitrogen atoms. C. the molecular ion is unstable. D. the molecule contains an even number of nitrogen atoms. E. the molecule contains bromine. Which of the following compounds would be expected to show a mass spectrum with a molecular ion having an odd mass-to-charge ratio? I. NH Br CI -Br H₂N NH2 III. IV. II. NH₂ A. I only B. II only C. III only D. IV only E. more than one of the above

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 31P
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In ¹H NMR, increased electron density in a C-H sigma bond causes A. Deshielding and an increased precessional frequency. B. Shielding and an increased precessional frequency. C. Deshielding and a decreased precessional frequency. D. Shielding and a decreased precessional frequency. A mass spectrum will show an M+2 peak molecular about 1/3 the intensity of the molecular peak if A. the molecule contains chlorine. B. the molecule contains an odd number of nitrogen atoms. C. the molecular ion is unstable. D. the molecule contains an even number of nitrogen atoms. E. the molecule contains bromine. Which of the following compounds would be expected to show a mass spectrum with a molecular ion having an odd mass-to-charge ratio? I. NH Br CI -Br H₂N NH2 III. IV. II. NH₂ A. I only B. II only C. III only D. IV only E. more than one of the above
Transcribed Image Text:In ¹H NMR, increased electron density in a C-H sigma bond causes A. Deshielding and an increased precessional frequency. B. Shielding and an increased precessional frequency. C. Deshielding and a decreased precessional frequency. D. Shielding and a decreased precessional frequency. A mass spectrum will show an M+2 peak molecular about 1/3 the intensity of the molecular peak if A. the molecule contains chlorine. B. the molecule contains an odd number of nitrogen atoms. C. the molecular ion is unstable. D. the molecule contains an even number of nitrogen atoms. E. the molecule contains bromine. Which of the following compounds would be expected to show a mass spectrum with a molecular ion having an odd mass-to-charge ratio? I. NH Br CI -Br H₂N NH2 III. IV. II. NH₂ A. I only B. II only C. III only D. IV only E. more than one of the above
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