C2H6-c2g5Cl-c2g5OH-c2H4-c2H5Br
1)C2H6+Cl2=C2H5Cl+HCl(над стрелкой hv) 2)C2H5Cl=CH4+HCl C2H4+H2O=C2H5OH 3)C2H5OH=C2H4+H2O(над стрелкой t и H2SO4) 4)C2H4+HBr=C2H5Br