Which among the following phenols does $NOT$ correctly match with their $IUPAC$ names?

What is $X$ in the given reaction?

Some compounds and their $pK_a$ values are given. Arrange them in decreasing order of their acidic strength.
$(i)$ Ethanol $(15.9)$,Phenol $(10.0)$,Cresol $(10.1)$,Water $(15.7)$
$(ii)$ $o$-Nitrophenol $(7.2)$,$m$-Nitrophenol $(8.3)$,Ethanol $(15.9)$,Water $(15.7)$,Phenol $(10.0)$

The rate of electrophilic substitution reaction in phenol is:

What will be the product of the reaction with $HBr$?

Reaction of phenol with which of the following reagents forms picric acid?