C.n=2-n= 3 is the following electronic transitions causes the absorption line at the shortest wavelength.
The relationship between energy and radiation wavelength is inverse. The largest energy shift, and hence the shortest wavelength, x nm, would occur during the transition from the highest to the lowest energy levels.
The wavelength of the radiation to be used for the measurement is a crucial factor. Keep in mind that the absorbance increases with increasing molar absorptivity. This also implies that the concentration of species that still produces a quantifiable absorbance value decreases with increasing molar absorptivity.
As the degree of delocalization increases, the maximum absorption shifts to longer wavelengths.
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