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Question
Which of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?
Which of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?
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Solution
The correct option is A
Out of the given options, the least hindered alkene is the one in option (a). In this alkene, syn addition is easier because one of the faces of the alkene is unhindered as both the methyl groups are present on the other side. 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 reacte with faster rate during catalytic hydrogenation. So, the alkene in option (a) undergoes the fastest reaction with H2 to give alkane.
Out of the given options, the least hindered alkene is the one in option (a). In this alkene, syn addition is easier because one of the faces of the alkene is unhindered as both the methyl groups are present on the other side. 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 reacte with faster rate during catalytic hydrogenation. So, the alkene in option (a) undergoes the fastest reaction with H2 to give alkane.
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