Any polychlorobiphenyl with molecular formula C12H6Cl4.
| Member | Definition | Role |
|---|
| 2,3,4,5-tetrachlorobiphenyl | | 2,3,4,5-tetrachlorobiphenyl |
| 2,3,5,6-tetrachlorobiphenyl | A tetrachlorobiphenyl that is biphenyl in which one of the phenyl groups is substituted by chlorines at positions 2, 3, 5, and 6. | 2,3,5,6-tetrachlorobiphenyl |
| 2,4,2',4'-tetrachlorobiphenyl | A tetrachlorobiphenyl that is biphenyl in which each of the phenyl groups is substituted at positions 2 and 4 by chlorines. | 2,2',4,4'-tetrachlorobiphenyl |
| 2,5,2',5'-tetrachlorobiphenyl | A tetrachlorobiphenyl that is biphenyl in which the hydrogens at the 2 and 5 position of each benzene ring are replaced by chlorines. | 2,2',5,5'-tetrachlorobiphenyl |
| 3,4,3',4'-tetrachlorobiphenyl | A tetrachlorobiphenyl that is biphenyl in which the hydrogens at position 3 and 4 on each phenyl group are replaced by chlorines. | 3,3',4,4'-tetrachlorobiphenyl |
| kc 400 | A tetrachlorobiphenyl that is biphenyl in which both phenyl groups are substituted by chlorines at positions 3 and 5. | 3,3',5,5'-tetrachlorobiphenyl |