Q.

Identify disproportionation reaction

1 CH4+2O2CO2+2H2O  
2 CH4+4Cl2CCl4+4HCl  
3 2F2+2OH-2F-+OF2+H2O  
4 2NO2+2OH-NO2-+NO3-+H2O  

Ans.

(4)

2NO2+2OH-NO2-+NO3-+H2O