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

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

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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 the energy required to induce a rotational transition is so small that it cannot be measured
All of these
Because rotational transitions are extremely rare

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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
Because absorbance is proportional to the concentration of the analyte, whereas %T is not
None of these

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