Multiple Choice
Which of the following compounds would you expect to show absorption in the portion of the electromagnetic spectrum that we can be visually seen without the use of equipment?
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Table of contents
- 1. A Review of General Chemistry5h 6m
- Summary23m
- Intro to Organic Chemistry4m
- Atomic Structure17m
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- 2. Molecular Representations1h 14m
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- R and S Configuration43m
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- Test 3:Disubstituted Cycloalkanes13m
- What is the Relationship Between Isomers?16m
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- 11. Radical Reactions1h 58m
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- 25. Condensation Chemistry2h 9m
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- Nomenclature of Heterocycles15m
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- 29. Amino Acids4h 20m
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- Reactions of Amino Acids: Esterification7m
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- 30. Peptides and Proteins2h 42m
- Peptides12m
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- 31. Catalysis in Organic Reactions1h 30m
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- Intro to Citric Acid Cycle7m
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- 34. Nucleic Acids1h 32m
- 35. Transition Metals6h 14m
- Electron Configuration of Elements45m
- Coordination Complexes20m
- Ligands24m
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- The 18 and 16 Electron Rule13m
- Cross-Coupling General Reactions40m
- Heck Reaction40m
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- Suzuki Reaction25m
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- Buchwald-Hartwig Amination Reaction19m
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- Catalytic Allylic Alkylation18m
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- 36. Synthetic Polymers1h 49m
- Introduction to Polymers6m
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- Polymers Structure and Properties8m
17. Ultraviolet Spectroscopy
The UV-Vis Spectroscopy
Multiple Choice
A compound with the formula C11H14O has a λmax 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 λmax of the compound.
A
I only
B
II and III
C
I and III
D
III and IV
E
II only
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Verified step by step guidance1
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.
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