Which of the following is NOT a component of Total Trihalomethanes (TTHMs)?

Total Trihalomethanes (TTHMs) are a group of four chemicals that are byproducts of the chlorination of drinking water. The recognized components of TTHMs include dibromochloromethane, trichloromethane (commonly known as chloroform), and bromodichloromethane. Each of these compounds consists of carbon, chlorine, and bromine, which are crucial in the context of water treatment and disinfection processes.

Hexachlorobenzene, on the other hand, is not a TTHM. It is a different type of chemical compound that contains chlorine but does not fit the specific criteria for trihalomethanes since it has six chlorine atoms bonded to a benzene ring rather than forming with bromine and chlorine as in TTHMs. This distinction underscores the importance of knowing the chemical structure and classification of compounds in water treatment, especially regarding the monitoring of disinfection byproducts and their implications for public health.