The alkyl halide functional group is composed of a hydrocarbon radical and some combination of halogens from family seven on the periodic table. The halogens are all toxic and, therefore, it is not difficult to see that the alkyl halides are also going to be toxic. The general formula for alkyl halide is R-X. The “R” represents one or more hydrocarbon radicals, and the “X” represents one or more halogens. The “X” can be replaced by fluorine (F), chlorine (Cl), bromine (Br), iodine (I), or combinations of two or more. It is important to remember that hydrocarbon derivatives started out as hydrocarbons before hydrogen was removed and other elements were added. Many of the hydrocarbon names are still used in the naming process with the alkyl halides.