Question

Question: Draw all alkenes that react with one equivalent of H₂ in the presence of a palladium catalyst to form each alkane. Consider constitutional isomers only

a.

b.

c.

Short answer

Answer

a.

b.

c.

Step-by-step solution

H2 Palladium catalyst

H₂Palladium catalyst is a solid catalyst used in the hydrogenation reaction of alkenes.

The reactant and the catalyst are in different phases; therefore, the reaction is termed heterogeneous catalysis.

Formation of alkanes from alkenes

Alkenes undergo a reduction reaction using a hydrogen palladium catalyst and form alkane.

The unsaturated carbon-carbon double bond is reduced to a saturated carbon-carbon single bond.

Reaction of alkenes in the presence of H2  palladium catalyst

Constitutional isomers of alkenes can result in the formation of identical alkanes.

a.

Formation of isopentane

from constitution isomer of 3-methyl-butene

b.

Formation of 1,1-dimethylcyclohexane

from constitutional isomers of dimethyl cyclohexene

c.

Formation of 1,1-dimethylcyclohexane

from constitutional isomers of dimethyl cyclohexene