Đáp án A
NH2CH2COOC2H5 + NaOH → NH2CH2COONa (X1) + C2H5OH
H2CH2COONa + HCl → ClH3N-CH2-COOH (X2)
ClH3N-CH2-COOH + CH3OH
→
H
C
l
k
h
a
n
ClH3N-CH2-COOCH3 (X3) + H2O
ClH3N-CH2-COOCH3 + 2KOH → H2N-CH2-COOK + CH3OH + KCl