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Question

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condition?

A
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B
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C
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D
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Solution

The correct option is A
The relative rates of hydrogenation decrease with the increase of steric hindrance.
In term of stability of alkenes, most stable alkene reacts very slowly and vice versa.
Cis alkene (a) is least stable and least sterically hindered. Hence it will reacter with faster rate during catalytic hydrogenation.

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