The major product $P$ formed in the following reaction is

Identify $X$ and $Y$ in the following reaction:
$X \xrightarrow{Y} \text{Benzoquinone}$

The order of acidic strength of $X, Y$ and $Z$ is:
Phenol reacts with dilute $HNO_3$ to form $X$ ($o$-nitrophenol) and $Y$ ($p$-nitrophenol). Phenol reacts with concentrated $HNO_3$ and $H_2SO_4$ to form $Z$ ($2,4,6$-trinitrophenol or picric acid).

What will be the product of the reaction shown below?

For the given compounds,the correct order of increasing $pK_{a}$ value is:

In the Reimer-Tiemann formylation reaction,by how much does the molecular weight of phenol increase?