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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Which structure is most consistent with the C-13 NMR spectrum shown below? (Note: there are actually two peaks at 125 ppm, even though it might look like just one)
Transcribed Image Text:### Nuclear Magnetic Resonance (NMR) Spectroscopy Analysis
#### Overview:
This figure includes an NMR spectral graph and the chemical structures of four molecules labeled A, B, C, and D.
#### NMR Spectrum Description:
- **Graph Axes:**
- The x-axis represents the chemical shift in parts per million (ppm).
- The spectrum ranges from approximately 0 to 200 ppm.
- **Peaks:**
- Major peaks are observed at around 2.00, 4.75, 6.50, 7.75, 16.00, 17.50, and 20.00 ppm.
#### Chemical Structures:
- **Compound A:**
- Structure contains a benzene ring with an ester linkage (C=O with an attached methoxy group), and an ethyl group on the benzene ring.
- **Compound B:**
- Structure similar to A, but with a methoxy group (–OCH₃) on the aromatic ring.
- **Compound C:**
- Contains a benzene ring with an ester linkage (C=O), and an ethyl group.
- **Compound D:**
- Similar to C, but includes a methoxy group on the aromatic ring instead of the ethyl group.
#### Interpretation:
The NMR spectrum and corresponding chemical structures help in identifying the specific environment of hydrogen atoms in different compounds, which is crucial for structural elucidation in organic chemistry. Comparing the peaks in the spectrum with the molecular structures aids in determining the presence of functional groups and the nature of chemical bonds.
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Concepts of NMR spectroscopy.
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