Match the following.

List-$I$ (Substance)	List-$II$ (Use)
$(A)$ Methanoic acid	$(i)$ Textile
$(B)$ Ethanoic acid	$(iv)$ Vinegar
$(C)$ Hexanedioic acid	$(ii)$ Polymer
$(D)$ Sodium benzoate	$(iii)$ Food preservative

Which of the following reactions produce ethyl cyanide $(CH_3 CH_2 CN)$ as a major product?
$1.$ $CH_3 CH_2 CH=NOH \xrightarrow{(CH_3 CO)_2 O} CH_3 CH_2 CN$
$2.$ $CH_3 CH_2 Cl \xrightarrow{\text{Ethanolic } KCN} CH_3 CH_2 CN$
$3.$ $CH_3 CH_2 Cl \xrightarrow{\text{Ethanolic } AgCN} CH_3 CH_2 NC$
$4.$ $CH_3 CH_2 CON(CH_3)_2 \xrightarrow[\text{Pyridine, } 70^{\circ} C]{C_6 H_5 SO_2 Cl} CH_3 CH_2 CN$

Match List-$I$ with List-$II$.

List-$I$ (Name of reaction)	List-$II$ (Reagent used)
$A$. Hell-Volhard-Zelinsky reaction	$I$. $NaOH + I_2$
$B$. Iodoform reaction	$II$. $(i) CrO_2Cl_2, CS_2; (ii) H_2O$
$C$. Etard reaction	$III$. $(i) Br_2 / \text{red phosphorus}; (ii) H_2O$
$D$. Gatterman-Koch reaction	$IV$. $CO, HCl, \text{anhyd. } AlCl_3$

Choose the correct answer from the options given below:

$CH_3COOH \xrightarrow{LiAlH_4} A$
$A + CH_3COOH \xrightarrow{H_3O^+} B + H_2O$
In the above reactions,'$A$' and '$B$' respectively are:

Identify the correct option based on the following reaction sequence:
Acetic anhydride $\xrightarrow[(ii) EtOH/H^+/\Delta]{(i) H_3O^+} (A)$ $\xrightarrow[(ii) H_3O^+/\Delta]{(i) NaOEt} (B)$

What is the major product of the following reaction?