Discussion
Consider the following statements about solvent effects.
1. A polar solvent shifts pi to pi star bands to longer wavelength
2. A polar solvent shifts n to pi star bands to shorter wavelength
3. Solvent polarity has no effect on band intensity
Which of the statements given above is or are correct?
Answer: B
The first two are correct and describe the opposite shifts that distinguish the two transitions; the third overstates, since solvent interaction affects intensity as well as position. That the two transitions move in opposite directions with polarity is the most reliable diagnostic available for telling them apart, and it costs only a second spectrum in a different solvent.
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