When benzene sulfonic acid and $p-$nitrophenol are treated with $NaHCO_3$,the gases released respectively are

Which of the following is the weakest acid?

The major product of the following reaction sequence is

Identify the missing reactant in the following reaction: $(CH_3CO)_2O + (?) \xrightarrow{H^+} \text{Aspirin} + CH_3COOH$

Consider the following reaction sequence:
$\text{Compound } (x)$ $\xrightarrow[(ii) H_3O^{+}]{(i) CO_2, NaOH, 120^{\circ}C, \text{high pressure}} \text{Compound } (y) \text{ (Major Product)}$
$[76.6\% C, 6.38\% H, \text{vapour density } 47]$
Compound $(y)$ develops a characteristic color with neutral $FeCl_3$ solution.
Identify the $INCORRECT$ statement from the following for the above sequence.

What is the product formed when salicylic acid is treated with zinc dust?