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 statements is correct about the catalytic function of enzymes?

Enzymes increase the equilibrium constant of a reaction.

Enzymes are consumed in the reaction they catalyze.

Enzymes change the overall free energy change of a reaction.

Enzymes lower the activation energy of a reaction.

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Verified step by step guidance

Understand that enzymes are biological catalysts that speed up chemical reactions without being consumed in the process.

Recognize that enzymes do not alter the equilibrium constant of a reaction. The equilibrium constant is determined by the free energies of the reactants and products, which remain unchanged by the presence of an enzyme.

Note that enzymes do not change the overall free energy change (ΔG) of a reaction. They only affect the rate at which equilibrium is reached, not the position of the equilibrium itself.

Identify that the primary role of enzymes is to lower the activation energy of a reaction. This is the energy barrier that must be overcome for reactants to be converted into products.

Conclude that by lowering the activation energy, enzymes increase the rate of the reaction, allowing it to proceed more quickly under the same conditions.