The initial concentration of $\text{X}$ and $\text{Y}$ were $\text{2}$ and $\text{4}\text{mole/L}$ respectively. For the following equilibrium $\mathrm{X}+2\mathrm{Y}\rightleftharpoons \mathrm{ }\mathrm{Z}$ which of the following relationship among equilibrium concentrations of $\text{X,}\text{Y}$ and $\text{Z}$ is not feasible?