객관식
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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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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검증된 단계별 안내1
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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