Phenol on treatment with conc. $\mathrm{H}\mathrm{N}{\mathrm{O}}_3$ gives

The functional group which is formed when Phenol is made to react with Chloroform in the presence of dilute Sodium hydroxide

The major product of the following reaction is:

The major product of the following reaction is:
 

What is the product "C" after following reactions -


 

The increasing order of the $pKa$ values of the following compounds is:

What is $\text{Z}$ in the following sequence of reactions?
$\mathrm{Phenol}\stackrel{\mathrm{Zn} \mathrm{dust}}{\to }\mathrm{X}\stackrel{{\mathrm{CH}}_3\mathrm{Cl}/\mathrm{Anhydrous} {\mathrm{AlCl}}_3}{\to }\mathrm{Y}\stackrel{\mathrm{Alkaline} {\mathrm{KMnO}}_4}{\to }\mathrm{Z}$