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

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

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

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

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