Identify $C$ in the following reaction sequence:

Which of the following is phenolic?

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

Given below are two statements.
Statement $I$: Phenols are weakly acidic.
Statement $II$: Therefore they are freely soluble in $NaOH$ solution and are weaker acids than alcohols and water.
Choose the most appropriate option.

In the given reaction sequence,identify the processes $X$ and $Y$ respectively to obtain salicylaldehyde from chlorobenzene:
$Chlorobenzene$ $\xrightarrow{X} Phenol$ $\xrightarrow{Y} Salicylaldehyde$

The sequence of reactions is: $Phenol$ $\xrightarrow[\Delta]{Zn \, dust} X$ $\xrightarrow[\text{Anhydrous } AlCl_3]{CH_3Cl} Y$ $\xrightarrow[\Delta]{KMnO_4} Z$. The final product $Z$ is: