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

3. Acids and Bases

Organic Chemistry Reactions

Organic Chemistry

3. Acids and Bases

Organic Chemistry Reactions

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Multiple Choice

In the context of photosynthesis, what is the primary difference between an absorption spectrum and an action spectrum?

An absorption spectrum measures the rate of photosynthesis at different wavelengths, while an action spectrum measures the light absorbed by pigments.

An absorption spectrum is a graphical representation of light emission, while an action spectrum is a graphical representation of light absorption.

An absorption spectrum shows the wavelengths of light absorbed by pigments, while an action spectrum shows the effectiveness of different wavelengths in driving photosynthesis.

An absorption spectrum is specific to chlorophyll, while an action spectrum includes all pigments involved in photosynthesis.

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Verified step by step guidance

Understand the concept of an absorption spectrum: It is a graph that shows the specific wavelengths of light absorbed by pigments. In photosynthesis, pigments like chlorophyll absorb light at certain wavelengths, which is crucial for the process.

Understand the concept of an action spectrum: It is a graph that illustrates the effectiveness of different wavelengths of light in driving the process of photosynthesis. This spectrum indicates which wavelengths are most effective in promoting photosynthesis.

Differentiate between the two spectra: The absorption spectrum focuses on the light absorbed by pigments, while the action spectrum focuses on the photosynthetic activity or effectiveness of those wavelengths.

Recognize the role of pigments: In photosynthesis, pigments such as chlorophyll absorb light energy, which is then used to convert carbon dioxide and water into glucose and oxygen. The absorption spectrum is specific to these pigments.

Connect the concepts: While the absorption spectrum shows which wavelengths are absorbed, the action spectrum shows which of those absorbed wavelengths are most effective in driving the photosynthesis process. This distinction is crucial for understanding how plants utilize light energy.