Phenol is:

Which of the following is the correct decreasing order of acidic strength for the compounds listed below?
$I$: $p$-chlorophenol
$II$: $p$-Cresol
$III$: $p$-nitrophenol
$IV$: $p$-methoxyphenol

One mole of phenol is treated with dilute $HNO_3$ at $298 \ K$ to give a mixture of products. The mixture is separated by steam distillation. The steam volatile compound $(X)$ is separated. The increase in percentage of oxygen in $(X)$ with respect to phenol is . . . . . . $\times 10^{-1}$ %. (Given molar mass in $g \ mol^{-1}$: $H:1, C:12, N:14, O:16$)

Identify $A$ in the following reaction: $A + \text{Acetic anhydride} \xrightarrow{H^{+}} \text{Aspirin} + \text{Acetic acid}$

The product $(A)$ in the following reaction is:

Which of the following compounds will give an ester with acid chloride?