Which of the following compounds has the lowest boiling point?

Identify the product $(A)$ obtained in the following reaction.
Phenol + concentrated $HNO_3$ $\xrightarrow[H_2SO_4]{\text{concentrated}}$ $A$

Consider the following reaction:
$Phenol$ $\xrightarrow{Zn\,dust} X$ $\xrightarrow[{Anhyd.\,AlCl_3}]{CH_3Cl} Y$ $\xrightarrow{Alkaline\,KMnO_4} Z$
The product $Z$ is:

The major product of the following reaction sequence is:
$C_6H_5OH \xrightarrow[(ii) NaOH, (iii) H^+]{(i) CHCl_3, NaOH(aq)} ?$

Aspirin is the product obtained by the acetylation of which substance?

What is the structure of the major product when phenol is treated with bromine water?