C->CH4->CH3Br->C2H6->C2H5Cl->C2H5OH->C2H5Na

C + 2H2 => CH4

CH4 + Br2 => CH3Br

2CH3Br + 2Na => CH3-CH3 + 2NaBr

CH3 - CH3 + CL2 => CH3-CH2CL + HCL

CH3-CH2CL + NaOH(вод) => CH3-CH2-OH + NaCL

2CH3-CH2-OH + 2Na => 2CH3-CH2-ONa + H2