Question: why ccl4 is called pyrene?
Answer: Carbon tetrachloride or 1,1,1,1-tetrachloromethane (IUPAC name) is also most uncommonly referred to as pyrene. The word pyrene is derived from the Greek pur -> pyr meaning fire. You know the words pyro technique (fire crackers), funeral pyre, pyrolysis etc. CCl4 does not burn; it can be used as a fire extinguisher.