Giải bài 5 trang 33 SGK Hóa học 12 nâng cao

a.  $CH_2OH(CHOH)_4CHO+Br_2+H_2O \rightarrow CH_2OH(CHOH)_4COOH+2HBr$

b.  $CH_2OH-(CHOH)_3-(O)C-CH_2OH+H_2\xrightarrow{{Ni,{t}^{o}}} CH_2OH-(CHOH)_4-CH_2OH$

c,d.  $CH_2OH-(CHOH)_3-(O)C-CH_2OH\overset{{OH^-}}{\leftrightarrows} CH_2OH-(CHOH)_4-CHO$

     $CH_2OH-(CHOH)_4CHO+2[Ag(NH_3)_2]OH\xrightarrow{{{t}^{o}}} CH_2OH(CHOH)_4COONH_4+2Ag\downarrow +3NH_3+H_2O$