Select the photochemical reaction with quantum yield two.
1
\(\rm {H}_2+{Cl}_2 \xrightarrow{\text { hv }} 2 {HCl}\)
2
\(\rm {H}_2+{Br}_2 \xrightarrow{\text { hv }} 2 {HBr}\)
3
\(\rm 2 {HBr} \xrightarrow{\text { hv }} {H}_2+{Br}_2\)
4
\(\rm {SO}_2+{Cl}_2 \xrightarrow{\text { hv }} {SO}_2 {Cl}_2\)