In which of the following reactions does carbon$-$carbon bond formation take place?

Phenol reacts with $CO_2$ in the presence of sodium hydroxide followed by acidification to give a steam volatile compound $X$. The compound $X$ on treatment with acetic anhydride in the presence of a catalytic amount of $H_2SO_4$ produces $Y$. Among the following:
$(i)$ antipyretic
$(ii)$ anti-inflammatory
$(iii)$ narcotic analgesic
$(iv)$ antiplatelet
the properties shown by compound $Y$ are

An organic compound with the molecular formula $C_6H_6O$ dissolves in $NaOH$, gives a characteristic colour with neutral $FeCl_3$ and on treatment with bromine water gives a tri-bromo derivative. Which is that compound among the following?

Which oxidizing agent is used to obtain chloranil from the oxidation of phenol?

Identify the product when phenol is heated with zinc dust.

Due to resonance,the oxygen atom of the $-OH$ group in phenol: