Question
Explain why π → π* transitions are the most useful transition in UV-VIS spectroscopy?
Answer :
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This transition is available in compounds with unsaturated centres, e.g., simple alkenes, aromatics, carbonyl compounds, etc. this transition requires lesser energy then transition in a simple alkene, although several transitions are available , the lowest energy transition is the π→ π*transition and a absorption band around 170nm-190nm in unconjugated alkenes is due to this transition in the case of , e.g., saturated ketones, the most intense band
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