Discussion
Match each transition with its typical wavelength region.
List I
A. Sigma to sigma star
B. Pi to pi star in a conjugated system
C. n to pi star
List II
P. Below 150 nm
Q. 220 to 400 nm
R. Above 280 nm and weak
Select the correct match.
Answer: A
The pairing is A-P, B-Q, C-R, and it is simply the four transitions in order of the energy each requires. Because only the last two fall inside the range an ordinary instrument covers, they are the only ones an analyst normally sees - which is why saturated compounds make such good solvents and why the technique is so closely associated with conjugation and lone pairs.
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