`a)` `C_6H_5OH + K → C_6H_5OK + 1/2 H_2` 

`b)` `C_6H_5OH + Na_2CO_3 → C_6H_5ONa + NaHCO_3` 

`c)` `C_2H_5CHO + 2AgNO_3 + NH_3` $\xrightarrow{t^o}$ `C_2H_5COONH_4` `+` `2Ag` `+` `3NH_3` `+` `H_2O`

`d)` `C_2H_5CHO + 2Cu(OH)_2 + KOH`$\xrightarrow{t^o}$`C_2H_5COOK + Cu_2O + 3 H_2O`

Chú ý phương trình c, d chỉ cần viết: 

`c)` `C_2H_5CHO` $\xrightarrow[t^o]{AgNO_3/NH_3}$ `C_2H_5COONH_4 + 2Ag`

`d)` `C_2H_5CHO ` $\xrightarrow[t^o]{Cu(OH)_2/KOH}$ `C_2H_5COOK + Cu_2O↓`(đỏ gạch )