In the hydrogenation of a compound containing a carbon-to-carbon triple bond, two products are possible, as in the reaction

The amount of each product can be controlled by using an appropriate catalyst. The Lindlar catalyst is a heterogeneous catalyst that produces only one of these products. Which product, I or II, do you think is produced and why? Draw a sketch of how the reaction might occur.

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CH3-C=C-CH3 + H₂ → CH3. H C=C (1) CH3 H or CH3, H C=C (II) H CH3