MCAT Organic Chemistry Question 159: Answer and Explanation
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Question: 159
9. Before absorbing an ultraviolet photon, electrons can be found in:
- A. the HOMO only.
- B. the LUMO only.
- C. both the HOMO and the LUMO.
- D. neither the HOMO nor the LUMO.
Correct Answer: A
Explanation:
The HOMO is the highest occupied molecular orbital. Only after absorbing ultraviolet light is an electron is excited from the HOMO to the LUMO, the lowest unoccupied molecular orbital.