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C. b C a CN d

C. b C a CN d

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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Based on the lettering system, please assign these letters to these peaks on real proton NMR

The image depicts a chemical structure of a substituted benzene ring. The benzene ring includes: - A nitrile group (CN) attached to the first carbon atom (position 'a'). - A methyl group (CH₃) attached to the second carbon atom (position 'b'). - The third carbon atom is part of a methyl group (indicating a second methyl group directly attached). - The benzene ring is labeled with letters a through f to denote each carbon atom in succession clockwise from the CN group. - Positions b, d, and f are not directly labeled with additional groups, but position c has the two methyl groups attached. This structural diagram is useful in organic chemistry to study the effects of different substituents on the benzene ring's properties and reactivity.
Transcribed Image Text:The image depicts a chemical structure of a substituted benzene ring. The benzene ring includes: - A nitrile group (CN) attached to the first carbon atom (position 'a'). - A methyl group (CH₃) attached to the second carbon atom (position 'b'). - The third carbon atom is part of a methyl group (indicating a second methyl group directly attached). - The benzene ring is labeled with letters a through f to denote each carbon atom in succession clockwise from the CN group. - Positions b, d, and f are not directly labeled with additional groups, but position c has the two methyl groups attached. This structural diagram is useful in organic chemistry to study the effects of different substituents on the benzene ring's properties and reactivity.
The image is an NMR (Nuclear Magnetic Resonance) spectrum, which is a graphical representation of the magnetic properties of atomic nuclei. The spectrum is used for determining the structure of organic compounds. ### Detailed Explanation of the NMR Spectrum: 1. **Horizontal Axis (Chemical Shift in ppm):** - The horizontal axis represents the chemical shift in parts per million (ppm), an important measure in NMR spectroscopy that indicates the environment of the hydrogen atoms in the sample. 2. **Vertical Axis (Intensity):** - The vertical axis represents the intensity of the NMR signals, which correlates to the number of nuclei in a particular chemical environment. 3. **Peak Assignments and Splitting Patterns:** - **7.560 - 7.227 ppm:** This region likely corresponds to aromatic protons. The multiplicity and splitting patterns suggest a complex environment typical of aromatic hydrogens. - **3.235 - 2.406 ppm:** Several peaks with fine structures, possibly indicating protons located near electronegative groups or double bonds. - **1.242 - 1.207 ppm:** A sharp peak which might represent protons in a simple aliphatic environment, such as methylene or methyl groups. 4. **Visual Features of the Graph:** - The graph shows distinct peaks at various ppm values, each representing different proton environments in the molecule. - Splitting patterns observed in peaks suggest the presence of neighboring protons, indicative of the compound’s structure. 5. **Additional Components:** - There are no explicit diagrams or additional components in the image apart from the spectrum itself. This NMR spectrum provides critical information about the molecular structure, helping chemists identify functional groups and understand the chemical composition of the sample.
Transcribed Image Text:The image is an NMR (Nuclear Magnetic Resonance) spectrum, which is a graphical representation of the magnetic properties of atomic nuclei. The spectrum is used for determining the structure of organic compounds. ### Detailed Explanation of the NMR Spectrum: 1. **Horizontal Axis (Chemical Shift in ppm):** - The horizontal axis represents the chemical shift in parts per million (ppm), an important measure in NMR spectroscopy that indicates the environment of the hydrogen atoms in the sample. 2. **Vertical Axis (Intensity):** - The vertical axis represents the intensity of the NMR signals, which correlates to the number of nuclei in a particular chemical environment. 3. **Peak Assignments and Splitting Patterns:** - **7.560 - 7.227 ppm:** This region likely corresponds to aromatic protons. The multiplicity and splitting patterns suggest a complex environment typical of aromatic hydrogens. - **3.235 - 2.406 ppm:** Several peaks with fine structures, possibly indicating protons located near electronegative groups or double bonds. - **1.242 - 1.207 ppm:** A sharp peak which might represent protons in a simple aliphatic environment, such as methylene or methyl groups. 4. **Visual Features of the Graph:** - The graph shows distinct peaks at various ppm values, each representing different proton environments in the molecule. - Splitting patterns observed in peaks suggest the presence of neighboring protons, indicative of the compound’s structure. 5. **Additional Components:** - There are no explicit diagrams or additional components in the image apart from the spectrum itself. This NMR spectrum provides critical information about the molecular structure, helping chemists identify functional groups and understand the chemical composition of the sample.
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