No.
It doesn't.
They are all homologues that contain a benzene ring
Less than 0.01%
Certainly not!
6
Benzene
yes
A given sample of butane might contain traces of benzene, but pure butane does not.
An aromatic compound contain a benzene ring.
Hydrocarbons which contain a benzene ring (google that yourself)
No. An OH group is not attached to the benzene ring.