The Kolbe-Schmidt reaction is used for the synthesis of:

The product $(B)$ will be:

Which of the following is the weakest acid?

What is the product formed when phenol reacts with concentrated $HNO_3$?

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.

The increasing order of $pK_{a}$ for the following phenols is:
$1$. $2, 4-$Dinitrophenol
$2$. $4-$Nitrophenol
$3$. $2, 4, 5-$Trimethylphenol
$4$. Phenol
$5$. $3-$Chlorophenol