The trans-alkenes

Question:

The trans-alkenes are formed by the reduction of alkynes with :

  1. $\mathrm{NaBH}_{4}$

  2. $\mathrm{Na} /$ liq. $\mathrm{NH}_{3}$

  3. $\mathrm{Sn}-\mathrm{HCl}$

  4. $\mathrm{H}_{2}-\mathrm{Pd} / \mathrm{C}, \mathrm{BaSO}_{4}$

Correct Option: , 2

Solution:

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