π-π* electronic transition occurs in molecules that have:
Correct answer: D. All of the above
- A. Double bond
- B. Triple bond
- C. Aromatic ring
- D. All of the above
Explanation
π → π* transitions need π electrons, which are present in double bonds, triple bonds, and aromatic systems. The transition absorbs UV or visible light depending on conjugation. All these structures can undergo π → π* electronic excitation
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