N2Cl4 + CH4 → CCl4 + 2 H2 + N2
This is an oxidation-reduction (redox) reaction:
C-IV - 8 e- → CIV (oxidation)
4 HI + 4 e- → 4 H0 (reduction)
2 NII + 4 e- → 2 N0 (reduction)
CH4 is a reducing agent, CH4 is an oxidizing agent, N2Cl4 is an oxidizing agent.