Which reactants are used to prepare $cis$ and $trans$ alkenes from alkynes?
- ALindlar catalyst for $cis$ and $Na/NH_3$ for $trans$
- BNa/NH_3 for $cis$ and Lindlar catalyst for $trans$
- CPd/$C$ for $cis$ and $H_2/Ni$ for $trans$
- DOnly $H_2/Pd$ is used for both
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