An alkyne[AL-kine] is added to a reaction vessel containing pressurized hydrogen gas and a catalyst consisting of palladium [pah-LAID-ee-um] poisoned by traces of lead(II) ions and quinoline [KWIN-oh-lin]. Which of the following is the major product of this reaction?

W) Alkane

X) Cis-alkene [sis-al-KEEN

Y) Trans-alkene

Z) Alcohol
X) CIS-ALKENE