The equilibrium constants $\text{K}_{P_{1}}$ and $\text{K}_{P_{1}}$ for the reactions
X ⇌ 2Y and Z ⇌ P + Q
respectively are in the ratio of 1 : 9. If the degree of dissociation of X and Z be equal then the ratio of total pressure at these equilibria is
1 : 36
1 : 1
1 : 3
1 : 9