Which of the following is the weakest acid?

Benzoylation of phenol with benzoyl chloride in the presence of dilute $NaOH$ gives phenyl benzoate. This reaction is an example of

Identify the correct order of acidic strength for the following compounds:
$I$. Ortho-nitrophenol
$II$. Para-nitrophenol
$III$. Meta-nitrophenol

Out of the two compounds shown below,the vapour pressure of $B$ at a particular temperature is expected to be:

An organic compound $A$ with empirical formula $C_6H_6O$ gives a sooty flame on burning. Its reaction with bromine solution in a low polarity solvent results in a high yield of $B$. $B$ is:

The strongest acid among the following aromatic compounds is