Phenol on treatment with $\text{C}{\text{O}}_2$ in the presence of NaOH followed by acidification produces compound X as the major product. X on treatment with ${\left(\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\right)}_2\mathrm{O}$ in the presence of catalytic amount of ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ produces