Цепочка превращений
C2H6-->C2H4-->C2H5OH-->CH3-CHO-->CH3-COOH-->CH2Cl-COOH-->NH2-CH2-COOH-->(-NH-CH2-CO-)n

C2H6-H2=C2H4C2H4+H2O=C2H5OHC2H5OH+CuO=CH3-CHO+Cu+H2OCH3-CHO+Ag2O=CH3-COOH+2AgCH3-COOH+Cl2=CH2Cl-COOH+HClCH2Cl-COOH+2NH3=NH2-CH2-COOH+NH4Cl(NH2-CH2-COOH)=>(-NH-CH2-CO-)n+nH2O