Give some uses of phenol. 

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

A diazonium chloride reacts with $\mathrm{Ph}\mathrm{-}\mathrm{OH}$ to give an azodye. The reaction is called

On reacting with neutral ferric chloride, phenol gives

Two aromatic compounds having formula ${\mathrm{C}}_7{\mathrm{H}}_8\mathrm{O}\mathrm{ }$which are easily identifiable by $\mathrm{F}\mathrm{e}\mathrm{C}{\mathrm{I}}_3$ solution test (violet colouration) are