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Find all peaks in these two NMR spectrums.

Find all peaks in these two NMR spectrums.

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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Find all peaks in these two NMR spectrums.

### HNMR Analysis for Unknown #1 (C8H8O) This graphic presents the HNMR (Hydrogen Nuclear Magnetic Resonance) spectrum for an unknown compound with the molecular formula C8H8O. #### Key Features of the Spectrum: - **Chemical Shifts (δ):** The x-axis represents the chemical shift in parts per million (ppm). The spectrum features peaks at specific ppm values, indicating the environment of hydrogen atoms in the compound. - Peaks are observed at approximately 2.40, 7.25, 7.34, and 11.15 ppm. - **Integration (Relative Area Under Peaks):** The y-axis indicates the intensity of the peaks, which correlates to the number of protons contributing to each signal. - The relative intensity of the peaks can help deduce the number of hydrogen atoms present in each environment. #### Peaks: 1. **2.40 ppm:** Likely represents hydrogens in a functional group adjacent to an electronegative atom, indicated by a lower shift. 2. **7.25 and 7.34 ppm:** Correspond to aromatic hydrogens, suggesting the presence of a benzene ring or similar aromatic structure. 3. **11.15 ppm:** Typically indicates a hydrogen attached to an oxygen, such as in an aldehyde or carboxylic acid group. #### Coupling Patterns and Splitting: - The splitting patterns observed in the peaks are crucial for understanding the connectivity and arrangement of atoms. - Analysis of these patterns helps infer the number of neighboring hydrogens. #### Interpretation: - This spectrum provides vital information for determining the structure of the unknown compound. - By analyzing the chemical shifts, splitting pattern, and integration, one can deduce the possible functional groups and overall molecular structure. For detailed analysis and structural elucidation, further spectroscopic details and complementary techniques may be required.
Transcribed Image Text:### HNMR Analysis for Unknown #1 (C8H8O) This graphic presents the HNMR (Hydrogen Nuclear Magnetic Resonance) spectrum for an unknown compound with the molecular formula C8H8O. #### Key Features of the Spectrum: - **Chemical Shifts (δ):** The x-axis represents the chemical shift in parts per million (ppm). The spectrum features peaks at specific ppm values, indicating the environment of hydrogen atoms in the compound. - Peaks are observed at approximately 2.40, 7.25, 7.34, and 11.15 ppm. - **Integration (Relative Area Under Peaks):** The y-axis indicates the intensity of the peaks, which correlates to the number of protons contributing to each signal. - The relative intensity of the peaks can help deduce the number of hydrogen atoms present in each environment. #### Peaks: 1. **2.40 ppm:** Likely represents hydrogens in a functional group adjacent to an electronegative atom, indicated by a lower shift. 2. **7.25 and 7.34 ppm:** Correspond to aromatic hydrogens, suggesting the presence of a benzene ring or similar aromatic structure. 3. **11.15 ppm:** Typically indicates a hydrogen attached to an oxygen, such as in an aldehyde or carboxylic acid group. #### Coupling Patterns and Splitting: - The splitting patterns observed in the peaks are crucial for understanding the connectivity and arrangement of atoms. - Analysis of these patterns helps infer the number of neighboring hydrogens. #### Interpretation: - This spectrum provides vital information for determining the structure of the unknown compound. - By analyzing the chemical shifts, splitting pattern, and integration, one can deduce the possible functional groups and overall molecular structure. For detailed analysis and structural elucidation, further spectroscopic details and complementary techniques may be required.
### CNMR Analysis for Unknown #1 (C8H8O) The graph shown is a Carbon-13 Nuclear Magnetic Resonance (CNMR) spectrum for an unknown compound with the molecular formula C8H8O. This technique is used to identify carbon atom environments within organic molecules. #### Details of the Spectrum: - **Peaks and Chemical Shifts (in ppm):** - **152.06 ppm** - **149.86 ppm** - **129.52 ppm** - **127.86 ppm** - **21.35 ppm** - **Graph Axes:** - **x-axis (f1 ppm):** Represents the chemical shift in parts per million (ppm). This scale helps identify different carbon environments. - **y-axis (Intensity):** The signals' intensity indicates the relative number of carbon atoms producing the signal. #### Interpretation: 1. **Peak Analysis:** - Peaks at 127.86 ppm and 129.52 ppm suggest the presence of aromatic carbons, common in aromatic compounds. - A peak at 149.86 ppm is indicative of oxygenated aromatic carbons, such as those found in phenolic or ether environments. 2. **Low Field (upfield) Peak:** - The 21.35 ppm peak could correspond to aliphatic carbons, indicating methylene or methyl groups present within the molecule. 3. **Overall Spectrum:** - The presence of peaks in both the aromatic (120-150 ppm) and the aliphatic (20-40 ppm) region supports a complex structure likely involving both aromatic and aliphatic components. This spectrum provides insight into the molecular structure, enabling the elucidation of unknown compounds by comparing observed chemical shifts with known chemical environments.
Transcribed Image Text:### CNMR Analysis for Unknown #1 (C8H8O) The graph shown is a Carbon-13 Nuclear Magnetic Resonance (CNMR) spectrum for an unknown compound with the molecular formula C8H8O. This technique is used to identify carbon atom environments within organic molecules. #### Details of the Spectrum: - **Peaks and Chemical Shifts (in ppm):** - **152.06 ppm** - **149.86 ppm** - **129.52 ppm** - **127.86 ppm** - **21.35 ppm** - **Graph Axes:** - **x-axis (f1 ppm):** Represents the chemical shift in parts per million (ppm). This scale helps identify different carbon environments. - **y-axis (Intensity):** The signals' intensity indicates the relative number of carbon atoms producing the signal. #### Interpretation: 1. **Peak Analysis:** - Peaks at 127.86 ppm and 129.52 ppm suggest the presence of aromatic carbons, common in aromatic compounds. - A peak at 149.86 ppm is indicative of oxygenated aromatic carbons, such as those found in phenolic or ether environments. 2. **Low Field (upfield) Peak:** - The 21.35 ppm peak could correspond to aliphatic carbons, indicating methylene or methyl groups present within the molecule. 3. **Overall Spectrum:** - The presence of peaks in both the aromatic (120-150 ppm) and the aliphatic (20-40 ppm) region supports a complex structure likely involving both aromatic and aliphatic components. This spectrum provides insight into the molecular structure, enabling the elucidation of unknown compounds by comparing observed chemical shifts with known chemical environments.
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