Which is the most suitable reagent for the following transformation?

Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?

The intermediate $\mathrm{X}$, in the reaction

Match List-I with List-II

	List-I		List-II
A		I	${\mathrm{Br}}_2$ in ${\mathrm{CS}}_2$
B		II	${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7/{\mathrm{H}}_2{\mathrm{SO}}_4$
C		III	$\mathrm{Zn}$
D		IV	${\mathrm{CHCl}}_3/\mathrm{NaOH}$

Question: Choose the correct answer from the options given below

In the given reaction 

the number of ${\mathrm{sp}}^2$ hybridised carbon (s) in compound $\text{'}\mathrm{X}\text{'}$ is _______.

The increasing order of ${\mathrm{pK}}_{\mathrm{a}}$ for the following phenols is

(A) 2,4-Dinitrophenol

(B) 4-Nitrophenol

(C) 2,4,5-Trimethylphenol

(D) Phenol

(E) 3-Chlorophenol

Choose the correct answer from the option given below :

The correct order of ${\mathrm{pK}}_{\mathrm{a}}$ values for the following compounds is: