CH4 + Br2 = CH3Br + HBr
CH3Br + Br2 = CH2Br1 + HBr
CH2Br2 + Br2 = CHBr3 + HBr
CHBr3 + Br2 = CBr4 + HBr
CH4 + Br2 = CH3Br + HBr
CH3Br + Br2 = CH2Br1 + HBr
CH2Br2 + Br2 = CHBr3 + HBr
CHBr3 + Br2 = CBr4 + HBr