In the reaction
Phenol $\xrightarrow{NaOH} (A)$ $\xrightarrow[140^{\circ}C]{CO_2, HCl} (B)$
here $B$ is

If the reaction sequence given below is carried out with $15$ moles of acetylene,the amount of the product $D$ formed (in $g$) is. . . . . The yields of $A, B, C$ and $D$ are given in parentheses. [Given: Atomic mass of $H=1, C=12, O=16, Cl=35$]

The major product of the following reaction is:

Product $(A)$ is

An aromatic compound $X$ when heated with $Zn$ powder gives benzoic acid,but when heated with soda lime,it gives phenol. Identify the compound $X$.

Write the nitration and bromination reactions of phenol.