# Which one of the following reactions does not occur?

$\begin {array} {1 1} (1)\;F_2+2Cl \longrightarrow 2F^{-}+Cl_2 \\ (2)\;Cl_2+2F \longrightarrow 2Cl^{-}+F_2 \\ (3)\;Br_2+2l^{-1} \longrightarrow 2Br^{-1}+I_2 \\ (4)\;Cl_2 +2 Br^{-} \longrightarrow 2Cl^{-}+Br_2 \end {array}$

$(2)\;Cl_2+2F \longrightarrow 2Cl^{-}+F_2$