Question

which catalyst is used to make cis-alkene?

Answer 1

Answer:

Lindlar's catalyst is a palladium catalyst poisoned with traces of lead and quinoline, that reduce its activity such that it can only reduce alkynes, not alkenes. It always gives the cis-alkene, in contrast to Na/NH3, which gives the trans alkenes. Lindlar's catalyst doesn't really have a “structure”

Explanation:

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Answer 2

Answer:

palladium catalyst

Lindlar's catalyst is a palladium catalyst poisoned with traces of lead and quinoline, that reduce its activity such that it can only reduce alkynes, not alkenes. It always gives the cis-alkene, in contrast to Na/NH3, which gives the trans alkenes. Lindlar's catalyst doesn't really have a “structure”.