Which of the following has the lowest boiling point?

The major product formed in the following reaction is:

Regarding the solubility of $p$-nitrophenol and salicylaldehyde in a base:

In the following reaction sequence,identify the major product $Y$:
$C_6H_5OH$ $\xrightarrow{C_6H_5COCl, \text{Base}} X$ $\xrightarrow{\text{Nitration}} Y$

$A$ trisubstituted compound '$A$',$C_{10}H_{12}O_2$ gives a neutral $FeCl_3$ test positive. Treatment of compound '$A$' with $NaOH$ and $CH_3Br$ gives $C_{11}H_{14}O_2$,with hydroiodic acid $(HI)$ gives methyl iodide,and with hot conc. $NaOH$ gives a compound $B$,$C_{10}H_{12}O_2$. Compound '$A$' also decolorises alkaline $KMnO_4$. The number of $\pi$ bonds present in the compound '$A$' is $...........$

What are $X$ and $Y$ in the following reactions?