Sodium phenoxide when heated with $CO_2$ under pressure at $125\,^{\circ}C$ yields a product which on acetylation produces $C$. The major product $C$ would be

Which of the following compounds has maximum volatility?

In the given reaction,$[X]$ will be:
$2\text{-hydroxybenzoic acid} \rightarrow{200^{\circ}C} [X]$

The product of the following reaction is:

Which of the following is the least acidic?

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: