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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
(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm
(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm
(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm
(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
(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm
(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm
(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm
(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...
Explanation:
Chemical shifts for the protons A-D:
1. Proton A: The chemical shift for proton A is around 6.8 ppm.
2. Proton B: The chemical shift for proton B is around 5.7 ppm.
3. Proton C: The chemical shift for proton C is around 3.9 ppm.
4. Proton D: The chemical shift for proton D is around 2.1 ppm.
Analysis of the compound:
- The compound has a methoxy group (OCH3) attached to it, which typically shows a chemical shift around 3.9 ppm.
- Proton A is likely to be deshielded due to the presence of the electron-withdrawing methoxy group, resulting in a higher chemical shift.
- Proton D is likely to be shielded by the methoxy group, resulting in a lower chemical shift compared to proton C.
Conclusion:
- Based on the analysis, the appropriate H NMR chemical shifts for the protons A-D in the compound are A-6.8, B-5.7, C-3.9, D-2.1 ppm, which is option (a).
- Hence, the correct answer is (a) A-6.8, B-5.7, C-3.9, D-2.1 ppm.
Chemical shifts for the protons A-D:
1. Proton A: The chemical shift for proton A is around 6.8 ppm.
2. Proton B: The chemical shift for proton B is around 5.7 ppm.
3. Proton C: The chemical shift for proton C is around 3.9 ppm.
4. Proton D: The chemical shift for proton D is around 2.1 ppm.
Analysis of the compound:
- The compound has a methoxy group (OCH3) attached to it, which typically shows a chemical shift around 3.9 ppm.
- Proton A is likely to be deshielded due to the presence of the electron-withdrawing methoxy group, resulting in a higher chemical shift.
- Proton D is likely to be shielded by the methoxy group, resulting in a lower chemical shift compared to proton C.
Conclusion:
- Based on the analysis, the appropriate H NMR chemical shifts for the protons A-D in the compound are A-6.8, B-5.7, C-3.9, D-2.1 ppm, which is option (a).
- Hence, the correct answer is (a) A-6.8, B-5.7, C-3.9, D-2.1 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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? for UPSC 2024 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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? covers all topics & solutions for UPSC 2024 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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? for UPSC 2024 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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? covers all topics & solutions for UPSC 2024 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(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm?.
Solutions for Appropriate H NMR chemical shifts (8) for the protons A-D for the following compound are[NET Dec 2011]C HC0D -OCH3HBHA(a) A-6.8, B-5.7, C-3.9, D-2.1 ppm(b) A-6.8, B-5.7, C-2.1, D-3.9 ppm(c) A-5.7, B-6.8, C-3.9, D-2.1 ppm(d) A-5.7, B-6.8, C-2.1, D-3.9 ppm? in English & in Hindi are available as part of our courses for UPSC.
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