Step-by-step explanation:
The given equation is as follows.
![2A + B_(2) \rightarrow 2AB](https://img.qammunity.org/2020/formulas/chemistry/high-school/h5wd7lleijhypcp9iy1pmlid0bg9qg8jkn.png)
Reactants are the species present on the left hand side of a chemical equation.
Products are the species present on the right hand side of a chemical equation.
Whereas coefficients are the number present in front of formulas.
Therefore, in the given reaction equation, matched terms are as follows.
- Reactant is
![B_(2)](https://img.qammunity.org/2020/formulas/chemistry/high-school/rdvs6yvf4ocnkk8sty3qievlo6agtljb7p.png)
- Product is AB.
- Coefficient is 2.