Which of the following compounds will react with $NaHCO_3$ solution to give sodium salt and carbon dioxide?

What is the major product $Y$ in the following reaction sequence?
$C_6H_5CONH_2$ $\xrightarrow[\text{Pyridine } 70^{\circ}C]{C_6H_5SO_2Cl} X$ $\xrightarrow[(ii) Br_2, FeBr_3]{(i) H_3O^+} Y$

Given below are two statements :
Statement $I :$ The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.
Statement $II :$ Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction.
Choose the most appropriate option

$Ph-CO_2H$ $\xrightarrow{SOCl_2} A$ $\xrightarrow{Me_2NH} B$ $\xrightarrow{(C)} Ph-CHO$. The unknown reagent $(C)$ is:

Arrange the products $I$,$II$,$III$ from the following reactions in decreasing order of their acid strength.
$A) \text{Propylbenzene} \xrightarrow[\text{ (ii) } H_3O^{+}]{\text{ (i) } KMnO_4 / OH^{-}} I$
$B) CH_3COOH \xrightarrow[\text{ (ii) } H_2O]{\text{ (i) } Br_2 / \text{red } P} II$
$C) \text{Bromobenzene}$ $\xrightarrow[\substack{\text{ (ii) } CO_2 / \text{dry ether} \\ \text{ (iii) } H_3O^{+}}]{\text{ (i) } Mg / \text{dry ether}} III$

Among the following,which is most highly ionized in water?