# $Kp_1\: and \: Kp_2$ for the reactions $X \leftrightharpoons Y+Z.............(1) \: and \: A \leftrightharpoons 2B ............(2)$ are in the ratio of 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio :

$\begin {array} {1 1} (1)\;1:1 & \quad (2)\;3:1 \\ (3)\;1:9 & \quad (4)\;36:1 \end {array}$