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The most suitable reagent for the following conversion is: H3C−C≡C−CH3 → cis-2-butene

1. Na/liquid NH3
2. H2, Pd/C, quinoline
3. Zn/HCl
4. Hg2+/H+, H2O

Correct answer: H2, Pd/C, quinoline

Solution

The conversion of an alkyne to a cis-alkene is achieved using Lindlar's catalyst, which is H2 with Pd/C and quinoline. This selectively hydrogenates the alkyne to a cis-alkene without further reduction to an alkane.

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