# Identify the reagents A and B used in the following reactions

$\begin {array} {1 1} (1)\;Sn/HCI,CI_2/hv & \quad (2)\;CI_2/ hv, Zn \\ (3)\;CI_2 / Fe, FeCI_3 & \quad (4)\;Zn,CI_2/FeCI_3 \end {array}$

(4) $Zn, CI_2/FeCI_3$