What is the product formed when phenol is treated with excess bromine water?

Identify the end product $(B)$ of the following sequence of reactions:
Phenol $\xrightarrow[100^{\circ}C]{\text{conc. } H_2SO_4} A$ $\xrightarrow{Br_2/H_2O \text{ (excess)}} B$

An organic compound $(C_8H_{10}O_2)$ rotates plane-polarized light. It produces a pink color with a neutral $FeCl_3$ solution. What is the total number of all the possible isomers for this compound?

An organic compound with molecular formula $C_7H_8O$ dissolves in $NaOH$ and gives a characteristic colour with $FeCl_3$. On treatment with bromine,it gives a tribromo derivative $C_7H_5OBr_3$. The compound is

Which of the following can not react with $NaHCO_3$?

An organic compound $C_6H_7N$ on reaction with $NaNO_2 / HCl$ at $273-278 \ K$ followed by warming with water gives $B$. $B$ reacts with concentrated $HNO_3$ to give $C$. What is $C$?