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

31. Catalysis in Organic Reactions

Introduction to Catalysis

Organic Chemistry

31. Catalysis in Organic Reactions

Introduction to Catalysis

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Multiple Choice

Which of the following is not commonly a part of the mechanism of enzyme-based catalysis?

Formation of an enzyme-substrate complex

Permanent alteration of the enzyme structure

Stabilization of the transition state

Lowering the activation energy of the reaction

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Verified step by step guidance

Understand the role of enzymes in catalysis: Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They achieve this by lowering the activation energy required for the reaction to proceed.

Examine the formation of an enzyme-substrate complex: Enzymes typically bind to substrates to form an enzyme-substrate complex. This complex is crucial for the catalytic activity as it positions the substrate in a way that facilitates the reaction.

Consider the stabilization of the transition state: Enzymes often stabilize the transition state of a reaction, which is the high-energy state that substrates must pass through to become products. By stabilizing this state, enzymes lower the energy barrier, making the reaction more favorable.

Evaluate the concept of lowering activation energy: Enzymes lower the activation energy of a reaction, which is the minimum energy required for the reaction to occur. This is a key feature of enzyme catalysis, allowing reactions to proceed faster and at lower temperatures.

Identify the incorrect statement: Permanent alteration of the enzyme structure is not a common part of enzyme-based catalysis. Enzymes are designed to return to their original state after the reaction, allowing them to catalyze multiple rounds of reactions without being permanently altered.