Discussion
What do the Woodward rules predict?
Answer: C
The rules give an empirical estimate of where a diene or an enone will absorb, starting from a base value and adding increments for each substituent and ring feature. They say nothing about intensity, solvent transparency or band count. An empirical scheme built from many measured examples can be more useful than a calculation from first principles when the molecules are complicated, and these rules survived for decades on exactly that basis. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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