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 part of a cholesterol molecule is polar?

Hydrocarbon tail

Methyl groups

Hydroxyl group

Steroid nucleus

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Verified step by step guidance

Understand the structure of cholesterol: Cholesterol is a type of lipid molecule that is composed of a steroid nucleus, a hydrocarbon tail, methyl groups, and a hydroxyl group.

Identify the functional groups: In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. The hydroxyl group (OH) is a common polar functional group.

Analyze polarity: Polarity in molecules arises due to differences in electronegativity between atoms. The hydroxyl group is polar because oxygen is more electronegative than hydrogen, creating a dipole moment.

Compare with other parts: The hydrocarbon tail and methyl groups are composed of carbon and hydrogen atoms, which have similar electronegativities, making these parts non-polar. The steroid nucleus is primarily carbon-based and non-polar as well.

Conclude which part is polar: Based on the analysis, the hydroxyl group is the polar part of the cholesterol molecule due to the presence of the electronegative oxygen atom.