From the illustration, the type of reaction represented by equation A would be a synthesis reaction while that of B would be a combustion reaction.
In synthesis reactions, two or more atoms of different elements or molecules come together to form a product. In equation A, H2 and Cl2 come together to form HCl. Thus, A is a synthesis reaction.
In combustion reactions, substances react in oxygen to generate new products, usually accompanied by light and the generation of heat. In equation B, CH4 reacts with O2 to produce CO2 and H2O with the production of heat. Thus, B is a combustion reaction.
More on different types of reactions can be found here: https://brainly.com/question/20479735