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JEE Main levelSingle correct optionDifficulty 2 of 3df026

In the hydrogenation of an alkene over a finely divided Pd or Ni surface, the first essential step is

  1. Aoxidation of the metal to its +4 state
  2. Bformation of a free carbocation in solution
  3. Cheterolytic fission of the alkene C=C bond in the gas phase
  4. Dadsorption of on the metal surface, weakening the H-H bond

Answer: D

Heterogeneous catalysis starts with adsorption of the reactants on the metal surface. Adsorbed dissociates into surface H atoms, and these are then transferred to the adsorbed alkene.
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