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

What are the products formed by the reaction of phenol with dilute $HNO_3$? By which method are these products separated,and what is the name of the compound that separates out and the reason for it?

Which of the following reactions will form a tri-bromo derivative of phenol?

In the following reaction:
$C_6H_5CH(CH_3)_2 + O_2$ $\xrightarrow{} C_6H_5C(CH_3)_2OOH$ $\xrightarrow{H^+/H_2O} A + B$
The compounds $A$ and $B$ respectively are $......$

Product $(A)$ is

Which compound has hydrogen bonding?