So for multiple bonds to be conjugated, they must be in an alternating double bond – single bond – double bond, etc arrangement. However, do they need to be continuous? In my textbook, they count the number of conjugated multiple bonds like this:
However, for other molecules such as 9,10-Bis(phenylethynyl)anthracene :
Would I count the number of conjugated multiple bonds as a total of 13 or as 7? In other words, do the bonds need to be continuous to be counted as conjugated pi bonds?