How many delocalised electrons (pi electrons) are there for each benzene molecule?

How many degrees of unsaturation is present in benzene?

This mono-substituted benzene with a common name has a vinyl group attached to the phenyl ring

This mono-substituted benzene has an aldehyde group (formyl) in its structure

This mono-substituted benzene has the phenyl group directly connected to an FG that has an sp hybridized Nitrogen in its structure

Which of the following is considered an aromatic ether?

Which of the following has an isopropyl group in its structure?

Which of the following is considered a disubstituted benzene?