Brominated biphenyls (PBB) is created through an electrophilic aromatic bromization out of the hydrocarbon biphenyl.

My paper says that will be only one isomer out of hexabromobiphenyl, C12H4Br6 And it states also that one phenyl group is still the active substituent when it is bromized. I wonder why it is only one isomer and I will be so thankful if you can draw the hexabrombiphenyl for me.

Part 2. If brom is in shortage can you isolate three isomers of dibrombipehnyl C12H8Br2. from the reaction. How will they look like and why. I prefer if you can draw them but systematic name is also OK.

Part 3 How many dibromphenylisomerer is it out there?