The most suitable reagent for the following conversion, is
Hg2+/H+,H2O
Na/liquid NH3
H2,Pd/C, quinoline
Zn/HCl
Alkynes on controlled hydrogenation gives alkenes.Pd-BaSO4/Quinoline is called Lindlars catalyst.In presence of Lindlars catalyst the product obtained is cis alkene.