Chemistry - Aromatic Hydrocarbon Question with Solution | TestHub

What is (Z) is in the following sequence of reaction?

$\mathrm{H}\mathrm{C}\equiv \mathrm{C}\mathrm{H}\stackrel{\left(\mathrm{i}\right)\text{ 2NaN}{\text{H}}_2\left(\mathrm{i}\mathrm{i}\right)\text{ 2C}{\text{H}}_3\mathrm{I}}{\to }\left(\mathrm{X}\right)\stackrel{\mathrm{H}\mathrm{g}\mathrm{S}{\mathrm{O}}_{\mathrm{4, }}{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4}{\to }\left(\mathrm{Y}\right)\stackrel{\left(\mathrm{i}\right)\text{ NaOH}+\text{B}{\text{r}}_2\left(\mathrm{i}\mathrm{i}\right){\text{H}}_3{\mathrm{O}}^{+}}{\to }\left(\mathrm{Z}\right)$