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

Which of the following is the major product,when $p$-cresol is treated with zinc dust?

Consider the following reaction:
$Phenol$ $\xrightarrow{Zn\,dust} X$ $\xrightarrow[{Anhyd.\,AlCl_3}]{CH_3Cl} Y$ $\xrightarrow{Alkaline\,KMnO_4} Z$
The product $Z$ is:

Which among the following phenolic compounds is most acidic in nature?

The major product $(B)$ of this reaction is:

The major product of the following reaction sequence is:
$C_6H_5OH \xrightarrow[(ii) NaOH, (iii) H^+]{(i) CHCl_3, NaOH(aq)} ?$