$CH_3CO_2C_2H_5$ on reaction with sodium ethoxide in ethanol gives $A$,which on heating in the presence of acid gives $B$. Compound $B$ is

What is the correct order of acidity for the given compounds?

Identify the structure of $Z$ in the following reaction sequence:
$Phthalic \ acid + NH_3 \rightleftharpoons X$ $\xrightarrow{\Delta} Y$ $\xrightarrow{\text{heating}} Z$

$R-CO-OR' + R''OH \xrightarrow{H^{\oplus}} R-CO-OR'' + R'OH$
The above reaction is an example of:

The unknown product $(A)$ is:

Compound$(s)$ which will liberate carbon dioxide with sodium bicarbonate solution is/are:
$A = \text{2,4,6-triamino phenol}$
$B = \text{Benzoic acid}$
$C = \text{Picric acid (2,4,6-trinitrophenol)}$