Which of the following reagents will produce salicylaldehyde on reaction with phenol?

The correct sequence of reactions to convert $p$-nitrophenol into quinol involves

Compound $A$ $(C_7H_8O)$ is insoluble in water,dilute $HCl$,and aqueous $NaHCO_3$,but it dissolves in dilute $NaOH$. When $A$ is treated with $Br_2$ water,it is converted into a compound $C_7H_5OBr_3$ rapidly. The structure of $A$ is

Phenol reacts with $CHCl_3$ and $NaOH$ (at $340 \ K$) to give

Which of the following compounds will be the most acidic?

Which of the following reactions is not an electrophilic substitution reaction?