Which of the following compounds does not form phenol or phenoxide upon reaction under standard laboratory conditions?

In the given esterification reaction,the labelled $^{18}O$ will be found in:

Identify $m$-cresol $(A)$,catechol $(B)$ and resorcinol $(C)$ from the following structures:

Scheme $1$ and $2$ describe the conversion of $P$ to $Q$ and $R$ to $S$,respectively. Scheme $3$ describes the synthesis of $T$ from $Q$ and $S$. The total number of $Br$ atoms in a molecule of $T$ is. . . . . . . .

What is $Z$ in the following sequence of reaction?
$Z$ $\xrightarrow{PCl_5} X$ $\xrightarrow{Alc. KOH} Y$ $\xrightarrow{dil. H_2SO_4} Z$

$p-$Cresol reacts with chloroform in an alkaline medium to give compound $A$,which reacts with hydrogen cyanide to form compound $Y$. Hydrolysis of $Y$ gives a chiral carboxylic acid. Identify the structure of the carboxylic acid.