The given chemical equation represents the reaction of CH3COOH(g) which decomposes to produce H4(g) and CO2(g). The type of reaction is determined by the changes that take place during the reaction, and the given reaction is known as Decarboxylation. Decarboxylation is a type of chemical reaction that involves the removal of a carboxyl group (COOH) from a molecule, releasing CO2 as a byproduct.