Spectroscopy
UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?

none of these
n → σ*
n → π* and π → π*
σ → σ*

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Spectroscopy
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

None of these
Because absorbance is proportional to the concentration of the analyte, whereas %T is not
Because %T is dependant on the power of the incident radiation
Because %T cannot be measured as accurately as absorbance

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Spectroscopy
Why are rotational transitions of little use to a spectroscopist?

Because rotational transitions are extremely rare
Because the energy required to induce a rotational transition is so small that it cannot be measured
All of these
Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions

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