What is the product formed when salicylic acid is heated with sodalime?

Identify the compound with the highest acidic strength from the following.

Which of the following fact$(s)$ explain$(s)$ why $p-$nitrophenol is more acidic than phenol?
$I$. $-I$ Effect of the nitro group.
$II$. Greater resonance effect of the $p-$nitrophenoxy group.
$III$. Steric effect of the bulky nitro group.

What is the common name of $Benzene-1,3-diol$?

Arrange the following compounds in the correct order of their acid strength.

What are $X$ and $Y$ respectively in the following set of reactions?