Question

$\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}\stackrel{{\mathrm{NaNH}}_2 \mathrm{liq}. {\mathrm{NH}}_3}{\to } \mathrm{H}-\mathrm{C}\equiv \stackrel{\mathrm{\_}}{\mathrm{C}} : {\mathrm{Na}}^{+}$
                                                              $\downarrow {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}$
${\mathrm{Na}}^{+} : \mathrm{C} \equiv \overline{\mathrm{C}}-{\mathrm{CH}}_2{\mathrm{CH}}_{3 }$$\stackrel{{\mathrm{NaNH}}_2\mathrm{Hiq}.{\mathrm{NH}}_3}{\leftarrow }$ $$\begin{gathered} \underset{1-\mathrm{Butyne} \\ \left(\mathrm{x}\right)}{\mathrm{H}-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_2{\mathrm{CH}}_3} \end{gathered}$$
          $\downarrow {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br}$
CH₃CH₂ - C $\equiv$C - CH₂ - CH₃
        3-Hexyne
            (y)