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

Two aromatic compounds having formula $C_7H_8O$ which are easily identifiable by $FeCl_3$ solution test (violet colouration) are

Azo dye is prepared by the coupling of phenol and:

Reaction of phenol with $NaOH$ followed by heating with $CO_{2}$ under high pressure,and subsequent acidification gives compound $X$ as the major product,which can be purified by steam distillation. When reacted with acetic anhydride in the presence of a trace amount of conc. $H_{2}SO_{4}$,compound $X$ produces $Y$ as the major product. Compound $Y$ is $....$

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

Write the chemical reactions for the preparation of anisole and phenetole from phenol.