MCAT General Chemistry Question 253: Answer and Explanation
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Question: 253
2. A change in which of the following combinations of molecular movement can never produce a peak in an IR spectrum?
- A. Translation and rotation
- B. Stretching and bending
- C. Vibration and translation
- D. Rotation and bending
Correct Answer: A
Explanation:
A From the passage, stretching and bending are types of vibration, while translation and rotation are not. All vibrations can potentially produce peaks in IR spectra, so choices B, C, and D are eliminated. Changes in translational and rotational movements alone do not show up in IR.