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Question

If a molecule Y contains two carbon- carbon double bonds, then how many moles of H2 are required for the complete hydrogenation of one mole of Y?
  1. 1
  2. 3
  3. 4
  4. 2


Solution

The correct option is D 2
One mole of hydrogen gas in presence of nickel or palladium as catalyst is required for complete hydrogenation of one mole of an unsaturated alkene with only one carbon-carbon double bond. 

Since Y contains two carbon-carbon double bonds, two moles of hydrogen gas will be required for complete hydrogenation of one mole of Y.

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