a) CH4 + Br2->CH3Br + HBr
CH3Br + NaOH->CH3OH + NaBr
2CH3OH + 2Na->2CH3ONa + H2
b)C2H6->CH2=CH2 + H2
CH2=CH2 + H2O<->CH3CH2OH
C2H5OH + 3O2->2CO2 + 3H2O