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Hydrogenation of Alkynes

Hydrogenation of Alkynes

9. Alkenes and Alkynes / Hydrogenation of Alkynes / Problem 4

The hydrogenation reaction of an alkyne using the Lindlar catalyst always gives a cis-alkene. Explain why.

ANSWERS OPTIONS

A

Because the hydrogens are added to different faces of the alkyne.

B

Because both hydrogens are added to the same face of the alkyne in a concerted manner.

C

Because of the higher stability of the cis alkene.

D

None of these.

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