Concept:Methane undergoes free-radical substitution with chlorine under ultraviolet light, and with excess chlorine the final substitution product is tetrachloromethane.
Explanation:In the presence of ultraviolet light, chlorine molecules dissociate into chlorine free radicals.
These radicals attack methane, replacing one hydrogen atom at a time.
The reaction produces hydrogen chloride at each step, along with successive chlorinated products: chloromethane, dichloromethane, trichloromethane, and finally tetrachloromethane.
With sufficient chlorine, all four hydrogen atoms in
CH4 are eventually replaced.
The overall final organic product is therefore
CCl4, also called tetrachloromethane or carbon tetrachloride.
Thus, the two final products are hydrogen chloride,
HCl, and tetrachloromethane,
CCl4.
Answer:C. tetrachloromethane