Explain why a strong absorption band observed at in a molecule’s spectrum is…

CHEMISTRY · Subjective · A Level · Chemistry · Organic analysis and spectroscopy · Organic analysis and spectroscopy

Problem

Explain why a strong absorption band observed at 650 nm650\,\text{nm} in a molecule’s spectrum is attributed to an electronic transition rather than a vibrational transition, even though both processes involve energy changes within the molecule.

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