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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Analytical chemistry identifies and measures substances using separation and instrumental methods. Chromatography is studied through stationary and mobile phases, retention and Rf values, while spectroscopy connects absorption of electromagnetic radiation with molecular structure and supports qualitative and quantitative analysis through techniques such as UV-visible and infrared spectroscopy.
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