Which of the following statements are correct about NMR spectroscopy? 1. All atomic nuclei have a magnetic moment. 2. 'H chemical shifts change monotonically with the percent s character of the carbon to which they are attached 3. 13c'H coupling constants change monotonically with the percent s character of the carbon to which they are attached 4. The most useful features of 'H NMR are the number of signals, the signal integration, and the coupling patterns. 5. The central CH, group of a 1-monosubstituted propane often has 6 lines. О 3, 4, 5 O 1, 4, 5 Correct Answer: 3, 5 О 1, 2, 3, 4, 5 O All atomic nuclei have a magnetic moment. О 2, 3, 4 3, 5 O O O O

Which of the following statements are correct about NMR spectroscopy? 1. All atomic nuclei have a magnetic moment. 2. 'H chemical shifts change monotonically with the percent s character of the carbon to which they are attached 3. 13c'H coupling constants change monotonically with the percent s character of the carbon to which they are attached 4. The most useful features of 'H NMR are the number of signals, the signal integration, and the coupling patterns. 5. The central CH, group of a 1-monosubstituted propane often has 6 lines. О 3, 4, 5 O 1, 4, 5 Correct Answer: 3, 5 О 1, 2, 3, 4, 5 O All atomic nuclei have a magnetic moment. О 2, 3, 4 3, 5 O O O O

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter19: Nuclear Magnetic Resonance Spectroscopy

Section: Chapter Questions

Problem 19.5QAP

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Spectra B 5000 overlapping t, s 200 180 160 140 120 100 80 60 40 20 ppm 11 10 ppm H 4000 3000 2000 1500 1000 500 Wavenumbers, cm*1 Structure: IR: 13C NMR: Number of types of C: Chemical shift(s) of signals: 'H NMR: Number of types of H: ⚫ Chemical shift(s) of signals: • Integrations: • Multiplicity of peaks: sextet t