(1)A:CH3-I(碘甲烷) B:CH2O(甲醛) C:CH3OOCH(甲酸甲酯)
(2)B--D :CH2O+H2--CH3OH
CH3-I+H2O--CH3OH+HI
CH3OOCH+H2O--CH3OH+HCOOH (可逆符号)