Cho sơ đồ chuyển hóa sau : Tinh bột $\to $ A₁ $\to $ A₂ $\to $ A₃ $\to $ A₄ $\to $ CH₃COOC₂H₅

A_1, A₂, A₃, A₄ có CTCT thu gọn lần lượt là :

$Tinh\,bot\,\xrightarrow{+{{H}_{2}}O;{{H}^{+}},{{t}^{0}}}{{A}_{1}}:glucozo\,({{C}_{6}}{{H}_{12}}{{O}_{6}})\xrightarrow{\,Lên\,men,30-{{35}^{0}}C}{{A}_{2}}:ancol\,etylic\,({{C}_{2}}{{H}_{5}}OH)\xrightarrow{+CuO,{{t}^{0}}}$

${{A}_{3}}:andehit\text{ax}etic\,(C{{H}_{3}}CHO)\xrightarrow{+{{O}_{2}},\,xúc\,\,tác\,M{{n}^{2+}}}{{A}_{4}}:Axit\,\text{ax}etic\,(C{{H}_{3}}COOH)\xrightarrow{+{{C}_{2}}{{H}_{5}}OH;Xt\,{{H}_{2}}SO4d}C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}$