CH4->C2H2->C2H4->C2H5OH->C2H4->C2H4Br2
2 CH4=C2H2+3 H2
C2H2+H2=C2H4
C2H4+H2O=C2H5OH
C2H5OH=C2H4+H2O
C2H4+Br2=C2H4Br2
H=+1; NO3=-1. Na=+1; SiO3=-1.
Fe(OH)₂=FeO+H₂O
FeO+H₂=Fe+H₂O
Fe+2HCl=FeCl₂+H₂
Cl
CH3-CH-CH2-CH3 + Cl2=CH3-C-CH2-CH3 + H2O
CH3 CH3
NO2
CH3-CH-CH2-CH3 + HNO3=CH3-C-CH2-CH3 + h2O
CH3 CH3
C5H12=C3H6 + C2H6
C5H12 + O2=CO2 + H2O