C+2H2=CH4
CH4+Br2=CH3Br+HBr
2CH3Br+2Na=C2H6+2NaBr
2C2H6+7O2=4CO2+6H2O
1.)2H+O₂ = 2H₂O
2.)Zn+H₂So₄=ZnSo₄+H₂
3)Cu+O₂=CuO
4)Na₂O+H₂O=2NaOH