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The trans-alkenes are formed by the reduction of alkynes with : (1) H2 - Pd/C, BaSO4 (2) NaBH4 (3) Na/liq. NH3 (4) Sn - HCl

1. H2 - Pd/C, BaSO4
2. NaBH4
3. Na/liq. NH3
4. Sn - HCl

Correct answer: Na/liq. NH3

Solution

The reduction of alkynes to trans-alkenes is effectively achieved using sodium in liquid ammonia, which facilitates the formation of the trans isomer through a unique mechanism that avoids the formation of the more stable cis isomer.

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