The reactant ($M$) is converted into product ($N$) in the presence of catalyst in a fixed bed reactor. All the flow rates ($F,\:G,\:H,\:P$ and $R$) in mol/$s$, and mole fraction of reactant ($M$) in these streams ($x_{F},\:x_{G},\:x_{H},\:x_{P}$ and $x_{R}$) are shown in the diagram.

The overall fractional conversion is

1. $\frac{x_{G}\:G-x_{H}\:H}{x_{G}\:G}$
2. $\frac{x_{G}\:G-x_{P}\:P}{x_{G}\:G}$
3. $\frac{x_{F}\:F-x_{H}\:H}{x_{F}\:F}$
4. $\frac{x_{F}\:F-x_{P}\:P}{x_{F}\:F}$