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Polychlorinated biphenyl (PCB) is produced by replacing two to five hydrogen atoms of a benzene ring with chlorine atoms. Based on the number of atoms replaced, they may be called as di, tri, tetra, and penta chlorinated biphenyl [27]. The generic name of these liquids is askarels, which means fire resistant. PCBs were known by their different commercial names in several countries across the world, e.g. Pyranol in the United States, Sowol in Russia, and Aroclors in many parts of the world.