MCAT Organic Chemistry Question 151: Answer and Explanation
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Question: 151
1. IR spectroscopy is most useful for distinguishing:
- A. double and triple bonds.
- B. C–H bonds.
- C. chirality of molecules.
- D. composition of racemic mixtures.
Correct Answer: A
Explanation:
Infrared spectroscopy is most useful for distinguishing between different functional groups. Almost all organic compounds have C–H bonds, choice (B), so except for fingerprinting a compound, these absorptions are not useful. Little information about the optical properties of a compound, such as choices (C) and (D), can be obtained by IR spectroscopy.