$A + CCl_4 + KOH \to$ Salicylic acid
'$A$' in the above reaction is

Which of the following will be most easily attacked by an electrophile?

Identify the product $(A)$ obtained in the following reaction.
Phenol + concentrated $HNO_3$ $\xrightarrow[H_2SO_4]{\text{concentrated}}$ $A$

Which of the following substances is the most volatile?

In the Liebermann's nitroso reaction,the sequential changes in the colour of phenol occur as:

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: