If you were asked in an exam to name this functional group, would you call it benzene or an aromatic hydrocarbon?
closed as off-topic by aventurin, Pritt Balagopal, Jon Custer, airhuff, Tyberius Mar 26 '18 at 14:24
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"Benzene" characterises a compound and not a functional group, "Aromatic Hydrocarbon" characterises a class of compounds. I would call your structure as a functional group, "phenyl".