Discussion
Why does a polar solvent shift a pi to pi star band to longer wavelength?
Answer: B
A pi to pi star excited state is more polar than the ground state, so a polar solvent lowers its energy further and the gap narrows. Refractive index affects reflection rather than transition energy, and the solvent's own absorption is a separate limit. Because the direction of the shift reveals which state is more polar, solvent studies are used to identify what kind of transition a band represents.
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