The ring deuteration of phenol:

How can $2,4,6$-trinitrophenol (picric acid) and benzoic acid be distinguished?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: Aryl halides cannot be prepared by the replacement of the hydroxyl group of phenol by a halogen atom.
Reason $R$: Phenols react with halogen acids violently.
In the light of the above statements,choose the most appropriate from the options given below:

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

The ionisation constant of phenol is higher than that of ethanol because

Phenol in the presence of sodium hydroxide reacts with chloroform to form salicylaldehyde. This reaction is known as: