Answer: An S reaction has one product and two or more reactants and a D reaction has one reactant and two or more products.
Step-by-step explanation:
In a synthesis reaction, two or more simple molecules or substances interact to form a more sophisticated product. (General equation: A + B → AB)
When one reactant decomposes into two or more products, this is known to as a decomposition reaction. (General equation: AB → A + B)