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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

16. Conjugated Systems

Conjugation Chemistry

Organic Chemistry

16. Conjugated Systems

Conjugation Chemistry

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Multiple Choice

Which of the following molecules is conjugated?

The figure illustrates the structure of a radical. A 6-carbon hexagonal ring is in a vertical orientation with C 1 occupying the topmost vertex. A double bond is present between C 1 and C 2. C 3 has an unpaired electron and is single bonded to C 1 of a 4-carbon alkene chain depicted as a line structure using 3 zigzag lines. In the alkene chain, a double bond is present between C 3 and C 4. C 1 of the alkene chain is single bonded to C H 3 below in the form of a line.

The figure illustrates the structure of an ion. A 5-carbon alkene chain is depicted as a line structure using 4 zigzag lines. A double bond is present between C 4 and C 5. C 2 is single bonded to C H 3 above in the form of a line. C 2 carries a positive charge. C 4 is single bonded to C H 3 above in the form of a line.

The figure illustrates the structure of a molecule. A central C atom is double bonded to C H 2 on the left in the form of 2 parallel lines. C H 2 is dash bonded to C H 3 on the upper left in the form of a dashed line and wedge bonded to H on the lower left. The central C atom is double bonded to a second central C atom on the right in the form of 2 parallel lines. The second central C atom is single bonded to C l on the upper right and B r on the lower right.

The figure illustrates the structure of a molecule. A 5-carbon pentagonal ring is in a vertical orientation with C 1 occupying the topmost vertex. A double bond is present between C 3 and C 4. C 1 is double bonded to O. C 2 is single bonded to F. C 5 is single bonded to C H 3 on the left and C H 3 on the upper left, each in the form of a line.

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Identify the presence of alternating single and multiple bonds in each molecule, which is a key feature of conjugation.

Examine the first molecule: It contains a benzene ring with alternating double bonds, but the rest of the structure does not continue this pattern.

Look at the second molecule: It has a carbocation adjacent to a double bond, which can allow for conjugation through resonance.

Analyze the third molecule: It has a triple bond and a double bond, but they are not in a position to allow for conjugation as they are separated by a single bond.

Consider the fourth molecule: It has a carbonyl group (C=O) adjacent to a double bond, which can participate in conjugation through resonance.

5:29m

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