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AP Chemistry
3.12 Properties of Photons
3.11 Spectroscopy and the Electromagnetic Spectrum
IntermediateMCQMathematicalConceptual21.5k
A gaseous sample of carbon monoxide, \(\text{CO(g)}\), is exposed to various regions of electromagnetic radiation. Three distinct molecular transitions observed during the investigation are summarized in the table below.

TransitionDescription of molecular event
\(1\)Promotion of a valence electron from a bonding molecular orbital to an antibonding orbital
\(2\)Change in the vibrational state associated with the stretching of the \(\text{C}\equiv\text{O}\) bond
\(3\)Change in the rotational state of the entire molecule around its center of mass

Which of the following correctly ranks the transitions in order of the frequency of the absorbed photon, from highest frequency to lowest frequency?

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