# For the gas phase reaction, $PCI_5(g) \leftrightharpoons PCI_3(g) +CI_2 (g)$ which of the following conditions are correct ?

$\begin {array} {1 1} (1)\;\Delta H > O\: and \: \Delta S < O & \quad (2)\;\Delta H = O\: and \: \Delta S < O \\ (3)\;\Delta H > O\: and \: \Delta S > O & \quad (4)\;\Delta H < O\: and \: \Delta S < O \end {array}$