What is $Z$ in the above sequence of reactions?

Which of the following reagents may be used to distinguish between phenol and benzoic acid?

Thymol,which is primarily a derivative of phenol,is used in which of the following?

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

Complete the following reaction: $C_6H_5OH + ArN_2^+Cl^- \xrightarrow{OH^-} ?$

The reactant is $4-hydroxy-3-methylbenzenesulfonic acid$. The reaction with $Br_2$ in $H_2O$ (bromine water) is an electrophilic aromatic substitution. The $-OH$ group is strongly activating and ortho/para directing. The $-SO_3H$ group is a good leaving group in the presence of excess bromine water. Predict the product of the reaction: $\xrightarrow{Br_2, H_2O} \text{Product}$