The compound which reacts with excess bromine to produce $2,4,6$-tribromophenol is

Cumene on oxidation in air gives a compound,$X$. This on reaction with dilute acid gives $Y$ and $Z$. $Y$ reacts with sodium metal and not $Z$. What is $Z$ ?

What is the common name of $Benzene-1,3-diol$?

Consider the following reactions:
$C_6H_5N_2Cl$ $\xrightarrow{H_2O, 283 \ K} X$ $\xrightarrow{Conc. \ HNO_3} Y$
$X \xrightarrow{Br_2/H_2O} Z$
$Y$ and $Z$ respectively are:

The major product of the following reaction is:

Phenol $\stackrel{X}{\longrightarrow}$ forms a tribromo derivative. "$X$" is