Noun
(organic chemistry, uncountable) A colourless solid hydrocarbon, C12H10, consisting of two benzene rings linked together by a single bond
(organic chemistry, countable) Any substituted or otherwise altered version of biphenyl, such as PCBs
halogenated biphenyls
A polychlorinated biphenyl (PCB) was reported ( published in 2009 ) in air samples collected in Chicago, Philadelphia, the Arctic, and several sites around the Great Lakes. Source: Internet
Aromatic atoms can be singly bonded to each other and biphenyl can be represented by c1ccccc1-c2ccccc2. Source: Internet
Similarly, DSM addressed stress with its Bel-Even (INCI: Biphenyl Azepanyl (and) Methanone (and) Propanediol), a small synthetic molecule that reduces the damaging effects of stress on skin. Source: Internet
In general, the first two digits refer to the number of carbon atoms in the biphenyl skeleton (for PCBs this is 12); the second two numbers indicate the percentage of chlorine by mass in the mixture. Source: Internet