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Alkynes can be reduced to cis-alkenes with the use of Lindlar’s catalyst.

1. H–C≡C–H → H2C=CH2
2. H–C≡C–H → H2C=CH–CH3
3. H–C≡C–CH3 → H2C=CH2
4. H–C≡C–CH3 → H2C=CH–CH3

Correct answer: H–C≡C–CH3 → H2C=CH–CH3

Solution

Lindlar's catalyst reduces alkynes to cis-alkenes by adding hydrogen selectively to one side of the triple bond.

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