The structure of salol 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 $H=1, C=12, O=16, Cl=35$]

Salicylic acid is prepared from phenol by:

Which group is present in phenol? What is the effect of this group on the ring and its reactions?

Which of the following reacts with diazonium salts to form dyes?

What product is formed when phenol reacts with $Br_2$ in $CCl_4$ at low temperature?