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

17. Ultraviolet Spectroscopy

The UV-Vis Spectroscopy

Organic Chemistry

17. Ultraviolet Spectroscopy

The UV-Vis Spectroscopy

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Multiple Choice

A compound with the formula C₁₁H₁₄O has a λ_max of approximately 244 nm. Based on the given information, which of the following compounds is the likely identity of the compound?
1.IR Spectroscopy revealed a signal of 1710 cm^-1.
2.Reduction of the functional group at 1710 cm^-1 created a chiral molecule.
3.Reduction of the functional group at 1710 cm^-1 caused no change in the λ_max of the compound.

I only

II and III

I and III

III and IV

II only

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Verified step by step guidance

Identify the functional group responsible for the IR signal at 1710 cm^-1. This signal is characteristic of a carbonyl group (C=O), typically found in ketones or aldehydes.

Examine the structures provided. Compounds I, II, and III contain a carbonyl group, while IV does not. This eliminates IV as a possibility.

Consider the reduction of the carbonyl group. Reduction of a ketone or aldehyde typically results in an alcohol. The problem states that reduction creates a chiral molecule, which suggests the formation of a secondary alcohol from a ketone.

Analyze the structures to determine which could form a chiral center upon reduction. Compound II, when reduced, would form a chiral center at the carbon adjacent to the carbonyl group, as it would have four different substituents.

Evaluate the effect of reduction on λmax. The problem states that reduction does not change the λmax, indicating that the conjugated system responsible for the UV absorption remains intact. Compound II maintains its conjugated system upon reduction, supporting the given information.