Arrange the following compounds in decreasing order of their acidic strength.

Phenol reacts with $CO_2$ in the presence of sodium hydroxide followed by acidification to give a steam volatile compound $X$. The compound $X$ on treatment with acetic anhydride in the presence of a catalytic amount of $H_2SO_4$ produces $Y$. Among the following:
$(i)$ antipyretic
$(ii)$ anti-inflammatory
$(iii)$ narcotic analgesic
$(iv)$ antiplatelet
the properties shown by compound $Y$ are

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:

In the reaction shown below,$Y$ is:

Which of the following products is obtained when phenol is treated with $CHCl_3$ and $NaOH$?

Consider the following reaction:
The product $'P'$ gives a positive ceric ammonium nitrate test. This is because of the presence of which of these $-OH$ group$(s)$?