What are $X$ and $Y$ respectively in the following reaction?
$Z$-product $\stackrel{Y}{\longleftarrow} 2$-butyne $\stackrel{X}{\longrightarrow} E$-product

  • A
    $Na / NH_3$ (liq.) and $Pd / BaSO_4 + H_2$
  • B
    $Ni / 140^{\circ} C$ and $Pd / BaSO_4 + H_2$
  • C
    $Ni / 140^{\circ} C$ and $Na / NH_3$ (liq.)
  • D
    $Pd / BaSO_4 + H_2$ and $Na / NH_3$ (liq.)

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