23.28Polychlorinated biphenyls (PCBs) are derived from biphenyl as the base structure. It is numbered asshown.(a)There are three monochloro derivatives of biphenyl:(b)The two chlorine substituents may be in the same ring (six isomers):The two chlorine substituents may be in different rings (six isomers):There are therefore a total of 12 isomeric dichlorobiphenyls.3,49-Dichlorobiphenyl ClClClCl4,49-Dichlorobiphenyl ClCl3,39-Dichlorobiphenyl
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