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

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The trans-alkenes are formed by the reduction of alkynes with :
(1) NaBH4 

(2) Na/liq.NH3 

(3) Sn–HCl 

(4) H2–Pd/C, BaSO4

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Birch reduction is anti addition. So trans alkene will be produced.

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Answer: (2) Na/liq.NH3

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