Identify the solvent used in the bromination of phenol to obtain $2,4,6$-tribromophenol.

Which of the following substituted phenols is the strongest acid?

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

Characteristics of the above reaction is:

The major product formed in the following reaction is:

Identify the product obtained when phenol reacts with concentrated sulphuric acid at $293 \ K$?