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Which of the four structures is consistent with the 1H-NMR spectrum shown below? t, 2H 5 (a) (c) 4 ход ngx PPM 2 tg, 2 H elle (b) (d) s. 9H t, 3 H 0

Which of the four structures is consistent with the 1H-NMR spectrum shown below? t, 2H 5 (a) (c) 4 ход ngx PPM 2 tg, 2 H elle (b) (d) s. 9H t, 3 H 0

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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**NMR Spectroscopy: Identifying Structures** **Question:** Which of the four structures is consistent with the \( ^1H \)-NMR spectrum shown below? ![NMR Spectrum](image link) **NMR Spectrum Details:** - A peak at approximately 0.9 ppm (singlet, integrating to 9H; labeled as 's, 9H') - A peak at approximately 1.2 ppm (triplet, integrating to 3H; labeled as 't, 3H') - A peak at approximately 2.0 ppm (triplet of quartets, integrating to 2H; labeled as 'tq, 2H') - A peak at approximately 4.1 ppm (triplet, integrating to 2H; labeled as 't, 2H') **Possible Structures:** - *(a)* Image represents a molecule with a certain arrangement of atoms. - *(b)* Image represents another molecule with a different atomic arrangement. - *(c)* Image shows yet another distinct molecular arrangement. - *(d)* Image presents a final distinct structure. **Analysis:** To determine which structure is consistent with the provided \( ^1H \)-NMR spectrum: 1. **0.9 ppm (s, 9H):** Typically corresponds to tert-butyl groups. 2. **1.2 ppm (t, 3H):** Usually indicates a methyl group (CH3) that is part of an ethyl group adjacent to a CH2 group. 3. **2.0 ppm (tq, 2H):** Suggests a methylene (CH2) group that is adjacent to both the tert-butyl group and another CH2 group. 4. **4.1 ppm (t, 2H):** Indicates a methylene group adjacent to an oxygen (i.e., part of an ester or ether). **Conclusion:** By comparing the NMR spectrum data with the possible structures, we can deduce which structure's hydrogen environments match the peaks observed in the spectrum. **Recommendation:** Carefully review the molecular structure diagrams provided and match them to the given NMR spectrum based on the chemical shift, splitting pattern, and integration of the peaks. **Answer Selection:** After thorough analysis, select the structure that aligns with the peaks described in the NMR spectrum. This will help in determining the correct molecular structure.
Transcribed Image Text:**NMR Spectroscopy: Identifying Structures** **Question:** Which of the four structures is consistent with the \( ^1H \)-NMR spectrum shown below? ![NMR Spectrum](image link) **NMR Spectrum Details:** - A peak at approximately 0.9 ppm (singlet, integrating to 9H; labeled as 's, 9H') - A peak at approximately 1.2 ppm (triplet, integrating to 3H; labeled as 't, 3H') - A peak at approximately 2.0 ppm (triplet of quartets, integrating to 2H; labeled as 'tq, 2H') - A peak at approximately 4.1 ppm (triplet, integrating to 2H; labeled as 't, 2H') **Possible Structures:** - *(a)* Image represents a molecule with a certain arrangement of atoms. - *(b)* Image represents another molecule with a different atomic arrangement. - *(c)* Image shows yet another distinct molecular arrangement. - *(d)* Image presents a final distinct structure. **Analysis:** To determine which structure is consistent with the provided \( ^1H \)-NMR spectrum: 1. **0.9 ppm (s, 9H):** Typically corresponds to tert-butyl groups. 2. **1.2 ppm (t, 3H):** Usually indicates a methyl group (CH3) that is part of an ethyl group adjacent to a CH2 group. 3. **2.0 ppm (tq, 2H):** Suggests a methylene (CH2) group that is adjacent to both the tert-butyl group and another CH2 group. 4. **4.1 ppm (t, 2H):** Indicates a methylene group adjacent to an oxygen (i.e., part of an ester or ether). **Conclusion:** By comparing the NMR spectrum data with the possible structures, we can deduce which structure's hydrogen environments match the peaks observed in the spectrum. **Recommendation:** Carefully review the molecular structure diagrams provided and match them to the given NMR spectrum based on the chemical shift, splitting pattern, and integration of the peaks. **Answer Selection:** After thorough analysis, select the structure that aligns with the peaks described in the NMR spectrum. This will help in determining the correct molecular structure.
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