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

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

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

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

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Spectroscopy
Why must the voltage supplied to a tungsten lamp be very stable?

Because the lamp will only function at a specific voltage
Because if it wasn't, the lamp would bum out
Because amount of energy the lamp emits is proportional to the fourth power of the operating voltage
All of these

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