part a
All of the carbons in this molecule are sp2 hybridized, except the red one. Two of the double bonds (green Cs) are conjugated but the red C interrupts the conjugation, so the other double bond (blue Cs) is not part of the conjugated system.
part b
The two double bonds (green Cs) are separated by the red Cs, so this molecule has no conjugated bonds.
part c
The carbon-carbon double bond (blue atoms) is conjugated with the carbon-oxygen double bond (red atoms).
part d
The carbon-carbon double bond (green atoms) is conjugated with one of the pi bonds ot the carbon-nitrogen triple bond (blue atoms).
part e
The conjugated bonds consist of one of the pi bonds of the carbon-carbon triple bond (green atoms), the carbon-carbon double bond (blue atoms), and the carbon-oxygen double bond (red atoms).
part f
The carbon-carbon double bond (blue atoms) is not conjugated with the carbon-oxygen double bond (red atoms) because the green C which separates them does not have a p orbital.
