What is the name of the given compound?

sym-Tribromobenzene 1,3,6-tribromobenzene m,m-Dibromobenzene None of the above

sym-Tribromobenzene

The prefix sym- is used for trihaloarenes with same halogen atom at alternate positions in the benzene ring (1, 3, 5). The prefixes o-, m- and p- are used for dihaloarenes depending on the relative positions of the two identical halogen atoms on the aromatic ring.