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Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are
[NET Dec 2011]
C HC
0
D -OCH3
HB
H
A
(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?
[NET Dec 2011]
C HC
0
D -OCH3
HB
H
A
(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?
Most Upvoted Answer
Appropriate H NMR chemical shifts (8) for the protons A-D for the foll...
Chemical Shifts for Protons A-D
Proton A: 5.7 ppm
Proton B: 6.8 ppm
Proton C: 2.1 ppm
Proton D: 3.9 ppm
Explanation
- Proton A is likely to be shielded by the electron-withdrawing effect of the methoxy group, leading to a downfield shift around 5.7 ppm.
- Proton B is likely to be adjacent to the carbonyl group, causing deshielding and resulting in a shift around 6.8 ppm.
- Proton C is likely to be shielded by the electron-donating effect of the methoxy group, leading to a shift around 2.1 ppm.
- Proton D is likely to be shielded by the methoxy group, but not as much as Proton C, resulting in a shift around 3.9 ppm.
Overall, the chemical shifts provided for protons A-D are reasonable based on the structural features of the compound.
Proton A: 5.7 ppm
Proton B: 6.8 ppm
Proton C: 2.1 ppm
Proton D: 3.9 ppm
Explanation
- Proton A is likely to be shielded by the electron-withdrawing effect of the methoxy group, leading to a downfield shift around 5.7 ppm.
- Proton B is likely to be adjacent to the carbonyl group, causing deshielding and resulting in a shift around 6.8 ppm.
- Proton C is likely to be shielded by the electron-donating effect of the methoxy group, leading to a shift around 2.1 ppm.
- Proton D is likely to be shielded by the methoxy group, but not as much as Proton C, resulting in a shift around 3.9 ppm.
Overall, the chemical shifts provided for protons A-D are reasonable based on the structural features of the compound.
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Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?
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Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?.
Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?.
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