What is the major product formed upon the sulfonation of benzoic acid?

The correct order of decreasing acid strength of the following acids is:
$(1)$ Trichloroacetic acid
$(2)$ Trifluoroacetic acid
$(3)$ Acetic acid
$(4)$ Formic acid

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

Assertion : $\beta$-Keto carboxylic acids lose $CO_2$ when heated at about $370 \ K$.
Reason : An enol is first formed by loss of $CO_2$,but it readily tautomerises to the more stable ketone.

Acetamide reacts with $P_2O_5$ (phosphorus pentaoxide) to give:

Which of the following reactions is not correctly matched with its product?