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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

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 configuration through a radical mechanism.

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