Answer:
Synthesis reaction
Step-by-step explanation:
When two or more substances react and produce a single product such type of reactions are called synthesis reaction. Like-
A + B → AB
where A and B are reactant and produce a single product AB.
EXAMPLE:-
2Na + Cl2 → 2 NaCl
In this reaction 2Na and Cl2 are substances which reacts and produce a single product 2NaCl.