What would be the major product in the following reaction?

cis-alkene

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trans-alkene

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alkane

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none of these

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Solution

The correct option is D cis-alkene
It is a heterogeneous catalyst consisting of palladium deposited on calcium carbonate. It is used for hydrogenation of alkynes to alkenes and the catalyst is deactivated by quinoline to prevent the formation of alkanes. In the given reaction triple bond is reduced to form double bond giving cis-alkene.

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