In the given reaction,$[X]$ will be:
$2\text{-hydroxybenzoic acid} \rightarrow{200^{\circ}C} [X]$

Compound '$B$' is

Phenol $\xrightarrow{Zn \, \text{dust}} X$ $\xrightarrow[Anhyd. \, AlCl_3]{CH_3Cl} Y$ $\xrightarrow{\text{Alkaline } KMnO_4} Z$. In the above reaction,what is $Z$?

The acidic nature of phenol is due to which of the following?

Identify the incorrect statement from the following.

Explain how the $-OH$ group attached to a carbon of a benzene ring activates it towards electrophilic substitution.