Identify the product $A$ obtained in the following reaction.
$\text{Phenol} + \text{Conc. Nitric acid} \xrightarrow{\text{conc. } H_2SO_4} A$

What is $X$ in the given reaction?

Identify the products $[A]$ and $[B]$,respectively in the following reaction:

Phenol with Hinsberg's reagent gives

Which among the following compounds has the highest melting point?

Given below are two statements:
Statement $I$: The acidic strength of monosubstituted nitrophenol is higher than phenol because of the electron-withdrawing nitro group.
Statement $II$: $o$-nitrophenol,$m$-nitrophenol,and $p$-nitrophenol will have the same acidic strength as they have one nitro group attached to the phenolic ring.
In the light of the above statements,choose the most appropriate answer from the options given below: