Which of the following can be used to separate phenol and benzoic acid?

Which among the following is obtained as a product when phenol is treated with $NaOH$ and $CO_2$ followed by acid hydrolysis?

The reaction of $CH_3CH=CH-C_6H_4-OH$ with $HBr$ gives:

An organic compound with the molecular formula $C_6H_6O$ dissolves in $NaOH$, gives a characteristic colour with neutral $FeCl_3$ and on treatment with bromine water gives a tri-bromo derivative. Which is that compound among the following?

Which one of the following is most reactive towards electrophilic attack?

Phenol $\xrightarrow{Br_2 / H_2O}$ Product formed is