When phenol is treated with $PCl_5$,the yield of chlorobenzene is generally poor because of the formation of

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

Assertion : Reimer-Tiemann reaction of phenol with $CCl_4$ in $NaOH$ at $340 \ K$ gives salicylic acid as the major product. Reason : The reaction occurs through intermediate formation of dichlorocarbene.

The correct order of acidic strength of the following compounds:
$A.$ Phenol
$B.$ Cresol
$C.$ $m-$Nitrophenol
$D.$ $p-$Nitrophenol

Give two reactions that show the acidic nature of phenol. Compare the acidity of phenol with that of ethanol.

An organic compound $C_6H_7N$ on reaction with $NaNO_2 / HCl$ at $273-278 \ K$ followed by warming with water gives $B$. $B$ reacts with concentrated $HNO_3$ to give $C$. What is $C$?