Which of the following catalyst/reagent is used to convert $C \equiv C$ triple bond to $C = C$ double bond to form $cis$ isomer of alkene?
- A$Na / \text{liquid } NH_3$
- B$Pd-C, \text{ quinoline}$
- C$ZnCl_2 / HCl$
- D$Na / Hg \text{ in } H_2O$
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