The correct order of acid strength of the following carboxylic acids is $-$

In the given reaction,$[X]$ will be:

$C_6H_6$ $\xrightarrow[AlCl_3]{(CH_3)_2CHCOCl}$ $\xrightarrow[\text{reduction}]{\text{Clemmensen}}$ $\xrightarrow[AlCl_3]{CH_3COCl}$ $\xrightarrow[\text{Red } P + HI]{H_3O^{\oplus}} (\text{Ibuprofen})$
Ibuprofen is

An organic compound $(A)$ (molecular formula $C_{8}H_{16}O_{2}$) was hydrolysed with dilute sulphuric acid to give a carboxylic acid $(B)$ and an alcohol $(C)$. Oxidation of $(C)$ with chromic acid produced $(B)$. $(C)$ on dehydration gives but$-1-$ene. Write equations for the reactions involved.

In the given options,which one is correct for the rate of hydrolysis?

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: