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NEET levelSingle correct optionDifficulty 1 of 3ro112

Hydrogenation of but-2-yne over Lindlar catalyst (Pd on poisoned with quinoline) gives mainly

  1. Abut-1-ene
  2. Bbutane
  3. Ctrans-but-2-ene
  4. Dcis-but-2-ene

Answer: D

The poisoned catalyst stops hydrogenation at the alkene stage and delivers both H atoms to the same face of the triple bond (syn addition). Syn addition to but-2-yne gives cis-but-2-ene, not butane.
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