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A ¹H NMR spectrum is shown for a molecule with the molecular formula of C9H10O2. Draw the structure that best fits this data. 11 11 10 9 SH 5 24 2 1 pom

A ¹H NMR spectrum is shown for a molecule with the molecular formula of C9H10O2. Draw the structure that best fits this data. 11 11 10 9 SH 5 24 2 1 pom

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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The image displays a Nuclear Magnetic Resonance (NMR) spectrum, which is used to determine the structure of organic compounds based on hydrogen environments. ### Explanation of the Graph: - **X-axis (ppm)**: Represents the chemical shift in parts per million (ppm). This shift is related to the electronic environment surrounding the hydrogen nuclei. - **Y-axis**: Represents the intensity of the signal, which is indicative of the number of hydrogens contributing to that particular signal. ### Peaks and Chemical Shifts: - **1H Peak at ~12 ppm**: This peak indicates a single hydrogen (1H) in a unique environment, typically associated with hydrogen in carboxylic acids or aldehydes. - **5H Peak centered at ~7-8 ppm**: This large peak corresponds to five hydrogens (5H), often indicative of hydrogens in an aromatic ring environment, such as a benzene ring. - **2H Peaks around 3-4 ppm**: These smaller peaks, each representing two hydrogens (2H), suggest hydrogens in an environment associated with electronegative atoms, such as hydrogens attached to oxygen or nitrogen, or possibly on carbons adjacent to such atoms. ### Summary: This NMR spectrum provides insights into the molecular structure by illustrating how many hydrogen atoms are present in different environments within a compound. The peaks indicate possible functional groups and structural motifs, aiding in the identification and analysis of organic molecules.
Transcribed Image Text:The image displays a Nuclear Magnetic Resonance (NMR) spectrum, which is used to determine the structure of organic compounds based on hydrogen environments. ### Explanation of the Graph: - **X-axis (ppm)**: Represents the chemical shift in parts per million (ppm). This shift is related to the electronic environment surrounding the hydrogen nuclei. - **Y-axis**: Represents the intensity of the signal, which is indicative of the number of hydrogens contributing to that particular signal. ### Peaks and Chemical Shifts: - **1H Peak at ~12 ppm**: This peak indicates a single hydrogen (1H) in a unique environment, typically associated with hydrogen in carboxylic acids or aldehydes. - **5H Peak centered at ~7-8 ppm**: This large peak corresponds to five hydrogens (5H), often indicative of hydrogens in an aromatic ring environment, such as a benzene ring. - **2H Peaks around 3-4 ppm**: These smaller peaks, each representing two hydrogens (2H), suggest hydrogens in an environment associated with electronegative atoms, such as hydrogens attached to oxygen or nitrogen, or possibly on carbons adjacent to such atoms. ### Summary: This NMR spectrum provides insights into the molecular structure by illustrating how many hydrogen atoms are present in different environments within a compound. The peaks indicate possible functional groups and structural motifs, aiding in the identification and analysis of organic molecules.
### ¹H NMR Spectrum Analysis for C₉H₁₀O₂ The image depicts a ¹H NMR spectrum for a molecule with the molecular formula C₉H₁₀O₂. Here's a detailed analysis of the spectrum: #### Spectrum Details: - **Chemical Shift (ppm):** - **12 ppm:** A singlet corresponding to 1H, indicative of an acidic proton such as a carboxylic acid or phenol hydrogen. - **7 ppm:** A singlet corresponding to 5H, typically associated with aromatic protons found in benzene rings. - **4 ppm:** A multiplet corresponding to 2H, possibly indicating protons adjacent to electronegative atoms such as oxygen (e.g., an ether or ester). - **1 ppm:** A doublet or triplet corresponding to 3H, common for methyl groups in aliphatic environments. #### Interpretation: - The presence of a peak at 12 ppm suggests a carboxylic acid group. - The 5H singlet at 7 ppm implies an unsubstituted benzene ring. - The 2H multiplet at around 4 ppm could signify a methylene group adjacent to an oxygen atom, as seen in esters or ethers. - The 3H at 1 ppm suggests a methyl group. #### Potential Structure: Based on these data points, the molecule likely contains: - An aromatic ring - A carboxylic acid group - An ester linkage Students are encouraged to draw structures considering these functional groups and conforming to the C₉H₁₀O₂ molecular formula.
Transcribed Image Text:### ¹H NMR Spectrum Analysis for C₉H₁₀O₂ The image depicts a ¹H NMR spectrum for a molecule with the molecular formula C₉H₁₀O₂. Here's a detailed analysis of the spectrum: #### Spectrum Details: - **Chemical Shift (ppm):** - **12 ppm:** A singlet corresponding to 1H, indicative of an acidic proton such as a carboxylic acid or phenol hydrogen. - **7 ppm:** A singlet corresponding to 5H, typically associated with aromatic protons found in benzene rings. - **4 ppm:** A multiplet corresponding to 2H, possibly indicating protons adjacent to electronegative atoms such as oxygen (e.g., an ether or ester). - **1 ppm:** A doublet or triplet corresponding to 3H, common for methyl groups in aliphatic environments. #### Interpretation: - The presence of a peak at 12 ppm suggests a carboxylic acid group. - The 5H singlet at 7 ppm implies an unsubstituted benzene ring. - The 2H multiplet at around 4 ppm could signify a methylene group adjacent to an oxygen atom, as seen in esters or ethers. - The 3H at 1 ppm suggests a methyl group. #### Potential Structure: Based on these data points, the molecule likely contains: - An aromatic ring - A carboxylic acid group - An ester linkage Students are encouraged to draw structures considering these functional groups and conforming to the C₉H₁₀O₂ molecular formula.
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