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# Phosgene is formed slowly from which one of the following on exposure to air and sunlight?

$\begin {array} {1 1} (1)\;CHCI_3 & \quad (2)\: H_3C\: CI \\ (3)\;H_3C\: OH & \quad (4)\;C_2H_5CI \end {array}$

(1) $CHCI_3$