Al4C3 - CH4 - CH3Cl - C2H6 - CH4
1) Al4C3+12H2O --> 4Al(OH)3+3CH4 2) CH4+Cl2 --> CH3Cl+HCl 3) 2CH3Cl+Na --> C2H6+NaCl 4) C2H6 --> C+2H2