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

2. Molecular Representations

Functional Groups

Organic Chemistry

2. Molecular Representations

Functional Groups

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Multiple Choice

Which functional group is primarily responsible for the absorption of light energy in chlorophyll molecules during photosynthesis?

Porphyrin ring

Carboxyl group

Carbonyl group

Hydroxyl group

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Verified step by step guidance

Understand the role of chlorophyll in photosynthesis: Chlorophyll is a pigment found in plants that plays a crucial role in absorbing light energy, which is then used to convert carbon dioxide and water into glucose and oxygen.

Identify the structure of chlorophyll: Chlorophyll molecules contain a porphyrin ring, which is a large, planar, and cyclic structure made up of four pyrrole subunits interconnected by methine bridges.

Recognize the significance of the porphyrin ring: The porphyrin ring in chlorophyll is responsible for its ability to absorb light, particularly in the blue and red regions of the electromagnetic spectrum. This absorption is due to the conjugated double bond system within the ring, which allows for the delocalization of electrons.

Differentiate between functional groups: Compare the porphyrin ring with other functional groups such as carboxyl, carbonyl, and hydroxyl groups. These groups do not have the same extensive conjugated system as the porphyrin ring and are not primarily responsible for light absorption in chlorophyll.

Conclude the analysis: Based on the structure and function of chlorophyll, the porphyrin ring is the functional group primarily responsible for the absorption of light energy during photosynthesis.