**1H-NMR Spectra Analysis:** The two graphs provided represent the ¹H-NMR spectra for two compounds with the chemical formula C₁₁H₁₆. The task is to identify the compounds using these spectra. **Graph a:** - **Chemical Shifts (δ ppm):** - There is a peak at approximately 7 ppm with an integration of 5. This indicates the presence of aromatic protons. - Another peak appears between 1-2 ppm with an integration of 9, suggesting the hydrogens are part of a simple alkyl chain. - A smaller peak appears around 2.5 ppm with an integration of 2, indicating protons adjacent to a group causing moderate deshielding. - **Analysis:** - The presence of 5 aromatic protons suggests a mono-substituted benzene ring. - The alkyl chain protons at around 1-2 ppm with integration of 9 could be from three methyl groups or equivalent. - These features are consistent with an aromatic compound with alkyl substituents. **Graph b:** - **Chemical Shifts (δ ppm):** - A notable peak appears around 7-8 ppm with an integration of 2, indicating protons in an aromatic environment but different from the first graph. - The large peak between 1-2 ppm with an integration of 9 is similar, suggesting multiple equivalent protons, possibly in a long alkyl chain. - Another peak around 3 ppm with an integration of 3, corresponding to protons that are likely adjacent to an electronegative atom or a π-bond system. - **Analysis:** - The 2 protons around 7-8 ppm suggest a disubstituted aromatic system. - The integration and chemical shift patterns might indicate an aromatic compound with different substitution compared to graph a. **Conclusion:** The combinations of integration values and chemical shift suggest that both compounds are aromatic hydrocarbons with different substitution patterns, which can be further interpreted with more context or additional analytical data.
**1H-NMR Spectra Analysis:** The two graphs provided represent the ¹H-NMR spectra for two compounds with the chemical formula C₁₁H₁₆. The task is to identify the compounds using these spectra. **Graph a:** - **Chemical Shifts (δ ppm):** - There is a peak at approximately 7 ppm with an integration of 5. This indicates the presence of aromatic protons. - Another peak appears between 1-2 ppm with an integration of 9, suggesting the hydrogens are part of a simple alkyl chain. - A smaller peak appears around 2.5 ppm with an integration of 2, indicating protons adjacent to a group causing moderate deshielding. - **Analysis:** - The presence of 5 aromatic protons suggests a mono-substituted benzene ring. - The alkyl chain protons at around 1-2 ppm with integration of 9 could be from three methyl groups or equivalent. - These features are consistent with an aromatic compound with alkyl substituents. **Graph b:** - **Chemical Shifts (δ ppm):** - A notable peak appears around 7-8 ppm with an integration of 2, indicating protons in an aromatic environment but different from the first graph. - The large peak between 1-2 ppm with an integration of 9 is similar, suggesting multiple equivalent protons, possibly in a long alkyl chain. - Another peak around 3 ppm with an integration of 3, corresponding to protons that are likely adjacent to an electronegative atom or a π-bond system. - **Analysis:** - The 2 protons around 7-8 ppm suggest a disubstituted aromatic system. - The integration and chemical shift patterns might indicate an aromatic compound with different substitution compared to graph a. **Conclusion:** The combinations of integration values and chemical shift suggest that both compounds are aromatic hydrocarbons with different substitution patterns, which can be further interpreted with more context or additional analytical data.
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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Transcribed Image Text:**1H-NMR Spectra Analysis:**
The two graphs provided represent the ¹H-NMR spectra for two compounds with the chemical formula C₁₁H₁₆. The task is to identify the compounds using these spectra.
**Graph a:**
- **Chemical Shifts (δ ppm):**
- There is a peak at approximately 7 ppm with an integration of 5. This indicates the presence of aromatic protons.
- Another peak appears between 1-2 ppm with an integration of 9, suggesting the hydrogens are part of a simple alkyl chain.
- A smaller peak appears around 2.5 ppm with an integration of 2, indicating protons adjacent to a group causing moderate deshielding.
- **Analysis:**
- The presence of 5 aromatic protons suggests a mono-substituted benzene ring.
- The alkyl chain protons at around 1-2 ppm with integration of 9 could be from three methyl groups or equivalent.
- These features are consistent with an aromatic compound with alkyl substituents.
**Graph b:**
- **Chemical Shifts (δ ppm):**
- A notable peak appears around 7-8 ppm with an integration of 2, indicating protons in an aromatic environment but different from the first graph.
- The large peak between 1-2 ppm with an integration of 9 is similar, suggesting multiple equivalent protons, possibly in a long alkyl chain.
- Another peak around 3 ppm with an integration of 3, corresponding to protons that are likely adjacent to an electronegative atom or a π-bond system.
- **Analysis:**
- The 2 protons around 7-8 ppm suggest a disubstituted aromatic system.
- The integration and chemical shift patterns might indicate an aromatic compound with different substitution compared to graph a.
**Conclusion:**
The combinations of integration values and chemical shift suggest that both compounds are aromatic hydrocarbons with different substitution patterns, which can be further interpreted with more context or additional analytical data.
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