A) \[{{H}_{2}}/Pd/BaS{{O}_{4}}\]
B) \[{{H}_{2}},Pt{{O}_{2}}\]
C) \[NaB{{H}_{4}}\]
D) \[Li-N{{H}_{3}}/{{C}_{2}}{{H}_{5}}OH\]
Correct Answer: D
Solution :
The partial reduction of alkynes by active metal in liquid ammonia takes place through trans vinylic anion which ultimately produces trans alkene.
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