Identify the reagent used for the following c | vedclass

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(A) The conversion of an internal alkyne $(CH_3-C \equiv C-CH_3)$ to a $cis$-alkene is a stereoselective reduction.Lindlar catalyst ($H_2$ / $Pd$ pois

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$H_2 / 	ext{Lindlar catalyst}$

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(A) The conversion of an internal alkyne $(CH_3-C \equiv C-CH_3)$ to a $cis$-alkene is a stereoselective reduction.Lindlar catalyst ($H_2$ / $Pd$ poisoned with $CaCO_3$ or $BaSO_4$ and quinoline) is used for the syn-addition of hydrogen to alkynes,which yields the $cis$-isomer.$Na$ / liquid $NH_3$ (Birch reduction) is used for the anti-addition of hydrogen to alkynes,which yields the $trans$-isomer.Therefore,the correct reagent is $H_2$ / Lindlar catalyst.

Identify the reagent used for the following conversion: $CH_3-C \equiv C-CH_3 \longrightarrow \text{cis-but-2-ene}$

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