1.C2H6->C2H5Cl->C2H5OH->CH3-COOH->Cl-CH2-COOH->NH2-CH2-COOH
2.C2H4->C2H50H->CH3-C=O-H->CH3-C=O-OH->Cl-CH2-COOH->NH2-CH2-COOH
3.C2H2->CH3-C=O-H