2KMnO4→K2MnO4+MnO2+O2
2MnO4−+10I−+16H+→2Mn2++5I2+8H2O
2CuBr→CuBr2+Cu
2NaBr+Cl2→2NaCl+Br2
Correct option is C. 2CuBr→CuBr2+Cu