(i) Substitution reaction: Reaction in which an atom or a group in a compound is replaced by another atom or a group.
(ii) Addition reaction: Reaction in which atoms combine with unsaturated carbon compounds to form saturated carbon compounds.
(iii) Decomposition reaction: A decomposition reaction is a type of chemical reaction in which one reactant yields two or more products. The general form for a decomposition reaction is:
AB→A+B
(iv) Combustion reaction: Reaction in which hydrocarbons combine with oxygen to form carbon dioxide and water along with heat and light.
In the given reaction chlorine atom is replacing the hydrogen atom to form trichloromethane. The reaction is a substitution reaction.