CH4-CH3Cl-C2H2-C2H5Cl-C2H6OH
1. CH4+Cl2 = CH3Cl+HCl
2. 2(CH3Cl) = C2H2 + 2(HCl)
3. C2H4+HCl = C2H5Cl
4. C2H5CL + NaOH = Na(HCl) + C2H5OH