Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

15. Analytical Techniques:IR, NMR, Mass Spect

H NMR Table

Organic Chemistry

15. Analytical Techniques:IR, NMR, Mass Spect

H NMR Table

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Multiple Choice

Which of the following chemical shift values could plausibly correspond to the protons in divinyl ether (CH₂=CH–O–CH=CH₂)

~ 7.8 ppm

~ 2.1 ppm

~ 5.0 ppm

~ 3.7 ppm

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Verified step by step guidance

Understand the structure of divinyl ether: CH2=CH–O–CH=CH2. It contains two vinyl groups (CH2=CH) connected by an ether linkage (O).

Consider the typical chemical shift values for protons in vinyl groups. Vinyl protons (CH=CH2) are usually found in the range of 4.5 to 6.5 ppm due to the deshielding effect of the double bond.

Evaluate the chemical environment of the protons in divinyl ether. The protons directly attached to the vinyl groups are influenced by the electron-withdrawing effect of the oxygen atom, which can cause a shift towards higher ppm values.

Compare the given chemical shift values: ~7.8 ppm, ~2.1 ppm, ~5.0 ppm, and ~3.7 ppm. The value ~5.0 ppm falls within the typical range for vinyl protons, making it a plausible shift for the protons in divinyl ether.

Conclude that the chemical shift value of ~5.0 ppm is consistent with the expected range for vinyl protons in divinyl ether, considering the influence of the ether linkage and the double bonds.