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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?

A
2
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B
1
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C
3
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D
4
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Solution

The correct option is A 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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