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 of the following is true about the functional group known as an ester?

Esters contain a nitrogen atom bonded to a carbonyl group.

Esters are characterized by a carbonyl group bonded to a hydroxyl group.

Esters are formed from the reaction between an alcohol and a carboxylic acid.

Esters are typically more acidic than carboxylic acids.

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Verified step by step guidance

Begin by identifying the structure of an ester. An ester is a functional group characterized by the formula \( \text{RCOOR'} \), where \( \text{R} \) and \( \text{R'} \) are hydrocarbon chains, and \( \text{COO} \) represents the ester linkage.

Understand the formation of esters. Esters are typically formed through a condensation reaction known as esterification, where an alcohol reacts with a carboxylic acid, resulting in the formation of an ester and water.

Clarify the misconception about esters containing a nitrogen atom. Esters do not contain nitrogen; this description is more characteristic of amides, which have a nitrogen atom bonded to a carbonyl group.

Differentiate esters from carboxylic acids in terms of acidity. Esters are generally less acidic than carboxylic acids because they lack the acidic hydrogen present in the carboxylic acid group \( \text{COOH} \).

Recognize the incorrect statement about esters being characterized by a carbonyl group bonded to a hydroxyl group. This description fits carboxylic acids, not esters, as esters have an alkoxy group \( \text{OR'} \) bonded to the carbonyl carbon.