What product is formed when an alkyne undergoes complete catalytic hydrogenation in the presence of excess hydrogen and a nickel catalyst?
Answer and explanation
Correct answer: A. Alkane
- Step 1: Alkynes possess carbon-carbon triple bonds ().
- Step 2: In the presence of excess hydrogen gas and a metal catalyst (Ni, Pt, or Pd), addition proceeds through the alkene intermediate to yield the fully saturated alkane.
Answer
Alkane.
Why not the others: 'Alkene' is formed only when hydrogenation is poisoned with Lindlar's catalyst; 'Alcohol' requires hydration; 'Aldehyde' requires hydroboration-oxidation.
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