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

32. Lipids

Steroids

Organic Chemistry

32. Lipids

Steroids

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Multiple Choice

Which one of the structures given below fulfills the given criteria?
1) Ketone at C3.
2) Double bond between C4 and C5.
3) An –OH group at C17 in β configuration.
4) A –CH₃ group at C17 in α configuration.

steroid structure

Chemical structure of a steroid with ketone at C3, double bond at C4-C5, and hydroxyl at C17.

steroid structure

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Verified step by step guidance

Identify the position of the ketone group in each structure. The ketone should be at the C3 position, which is typically the third carbon in the steroid backbone.

Examine the presence of a double bond between C4 and C5 in each structure. This is a specific requirement for the correct structure.

Check the configuration of the hydroxyl group (-OH) at C17. It should be in the β configuration, which means it is oriented above the plane of the steroid nucleus.

Verify the configuration of the methyl group (-CH3) at C17. It should be in the α configuration, indicating it is oriented below the plane of the steroid nucleus.

Compare each structure against these criteria to determine which one fulfills all the given conditions. The correct structure will have the ketone at C3, a double bond between C4 and C5, an -OH group at C17 in β configuration, and a -CH3 group at C17 in α configuration.