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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev218

The Pd-catalysed oxidation of ethene to ethanal in water follows the overall equation . Select the correct statements.

  1. AWater is the reaction medium, so no chlorinated organic solvent is required
  2. BThe atom economy of the overall equation is 100%
  3. CThe process needs a stoichiometric amount of a toxic organic oxidant
  4. DIn the catalytic cycle palladium(II) is reduced to palladium(0) and then reoxidised

Answer: A, B, D

The reaction is run in water (A true). Mass of reactants equals mass of ethanal , so atom economy is 100% (B true). Oxygen is the terminal oxidant, not an organic one (C false). Pd(II) oxidises ethene and is reoxidised to continue the cycle (D true).
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