Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 16, Problem 16.7QAP
Interpretation Introduction

Interpretation:

The number of vibrational modes and IR absorption bands of sulfur dioxide molecule should be determined.

Concept introduction:

When the atom of a molecule moves, there is translation and rotation in the molecule. The uncertainty principle of Heisenberg states that the atoms of the molecule are in the continuous motion. The modes of vibrations may be IR or Raman active.

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13C NMR spectroscopy provides valuable information about the environments of a molecule's carbon atoms. Since carbon atoms are often connected to hydrogen atoms, which could split the carbon signal through spin-spin coupling, the coupling between C and H is often "turned off" through the use of broadband decoupling, causing each C signal to appear as a singlet. Draw an isomer of C5H11Cl that would be expected to have four resonances in its 13C NMR spectra.
Which of the following statements is FALSE? a.) The absorptions in IR are attributed to transitions between rotational energy levels of the molecules. b.) The UV spectrum provides information about the valence electrons. c.) UV absorptions are attributed to electronic transitions. d.) NMR spectrometers use radio frequency energy
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