Identify the compound with the highest acidic strength from the following.

Phenol $+$ Aniline $\xrightarrow[{KOH}]{{C_6H_5N_2^+Cl^{-}}}$ Major Product $:$ Product will be $:$

The major product of the following reaction sequence is:
Aniline $\xrightarrow[(i) NaNO_2, HCl, 273-278K]{(ii) H_2O, warm} \text{Product}$ $\xrightarrow[(iv) NaOH]{(iii) Br_2, (excess)} \text{Product}$ $\xrightarrow{(v) CH_3I} \text{Final Product}$

Which of the following compounds is obtained when phenol reacts with dilute nitric acid at low temperature?

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 unknown product $(A)$ in the following reaction is:
Salicylic acid + $2I-Cl \rightarrow (A)$