But-2-yne is partially hydrogenated with H2 over Lindlar's catalyst. The product is

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But-2-yne is partially hydrogenated with $H X_{2}$ over Lindlar's catalyst. The product is

Acis-but-2-ene
Bbutane
Cbut-1-ene
Dtrans-but-2-ene

Answer: A

Lindlar's catalyst (Pd on

CaCO X_{3}

, poisoned with quinoline or lead acetate) stops at the alkene stage. Both hydrogens are delivered to the same face of the triple bond (syn addition), giving the cis (Z) alkene.

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But-2-yne is partially hydrogenated with HX2​ over Lindlar's catalyst. The product is

Answer: A

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But-2-yne is partially hydrogenated with $H X_{2}$ over Lindlar's catalyst. The product is