There should only have one singlet resonance for 1,1,2,2-tetrachloroethane. There is one hydrogen on each carbon. both of them have the exact same environment. Thus, it is shown as 1 singlet resonance. Solution There should only have one singlet resonance for 1,1,2,2-tetrachloroethane. There is one hydrogen on each carbon. both of them have the exact same environment. Thus, it is shown as 1 singlet resonance..