Which of the following can not react with $NaHCO_3$?

Which compound has the highest value of $pK_{a}$?

Given below are two statements :
Statement $I$ : Picric acid is $2,4,6$-trinitrotoluene.
Statement $II$ : Phenol-$2,4$-disulphonic acid is treated with conc. $HNO_3$ to get picric acid.
In the light of the above statements,choose the most appropriate answer from the options given below :

What are $A, B, C$ and $D$ in the following reactions?
$i)$ Aniline $\xrightarrow[273 \ K]{NaNO_2 \mid HCl} A$ $\xrightarrow{B} \text{Phenol}$
$ii)$ Cumene $\xrightarrow{O_2} C$ $\xrightarrow{D} \text{Phenol} + \text{acetone}$

Which among the following compounds has the highest solubility in water?

Predict the major product for the following reaction: