How will you prepare benzoic acid using Grignard reagent?

The correct structure of the product ‘$\mathrm{A}$’ formed in the reaction

In the following reaction,

$\mathrm{HC}\equiv \mathrm{CH}\underset{{\mathrm{HgSO}}_4}{\overset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\mathrm{X}$ . Product ‘$\mathrm{X}$’ will not give

Predict the product $\mathrm{Z}$ in the following series of reactions:

Ethanoic acid$\stackrel{{\mathrm{PCl}}_5}{\to }\mathrm{X}\underset{\mathrm{Anhydrous} {\mathrm{AlCl}}_3}{\overset{{\mathrm{C}}_6{\mathrm{H}}_6}{\to }}\mathrm{Y}\underset{\mathrm{ii}) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\mathrm{i}) {\mathrm{CH}}_3\mathrm{MgBr}}{\to }}\mathrm{Z}$

Which of the following represents the correct order of acidity in the given compounds: