Phenol $\stackrel{X}{\longrightarrow}$ forms a tribromo derivative. "$X$" is

The correct order of acidity of the following is:

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

Consider the following reaction:
The product $'P'$ gives a positive ceric ammonium nitrate test. This is because of the presence of which of these $-OH$ group$(s)$?

When benzene sulfonic acid and $p-$nitrophenol are treated with $NaHCO_3$,the gases released respectively are

An organic compound $A$ with empirical formula $C_6H_6O$ gives a sooty flame on burning. Its reaction with bromine solution in a low polarity solvent results in a high yield of $B$. $B$ is: