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

The general formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}{\mathrm{O}}_{\mathrm{2}}$ could be for open chain _______.

In the given transformation, which the following is the most appropriate reagent?

The major product obtained in the following reaction is:

The major product of the following reaction is:

$\mathrm{R}-\mathrm{C}\equiv \mathrm{N}\underset{\left(2\right){\mathrm{H}}_2\mathrm{O}}{\overset{\left(1\right){\mathrm{AH}}_1-\mathrm{Bu}{)}_2}{\to }}$?