1) H2N-CH2-CH2-COOH+CH3-CH2-OH= 2) C6H5NO2+H2= 3) H2N-CH2-CH2-COOH+H2N-CH2-CH2-CH2-COOH=
1) H2N-CH2-CH2-COO-CH2-CH3 + H2O 2)C6H5NO2+3H2=>C6H5NH2+2H2O 3)H2N-CH2-CH2-CO-NH-CH2-CH2-CH2-COOH+H2O