Which of the following compounds has the lowest solubility in water?

What does phenol give with dilute $HNO_3$?

Write the chemical equations for the following reactions:
$(i)$ Reimer-Tiemann reaction
$(ii)$ Kolbe's reaction

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.

Which of the following reagents is used in the conversion of phenol into picric acid?

Identify $X$ and $Y$ in the following reactions: