1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion 2-butyne on controlled hydrogenation with Pd / CaCO 3 in presence of PbO gives cis- 2-butene. Reason Hydrogenation occur at the surfaces of metal containing adsorbed hydrogen. of metal containing adsorbed hydrogen.

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Q. Assertion $2$-butyne on controlled hydrogenation with $Pd / CaCO _{3}$ in presence of $PbO$ gives cis- $2$-butene.
Reason Hydrogenation occur at the surfaces of metal containing adsorbed hydrogen. of metal containing adsorbed hydrogen.

AIIMSAIIMS 2014

Solution:

Poisoning by $PbO$ prevent further hydrogenation of alkene to alkane.