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(B) The conversion of an internal alkyne (but$-2-$yne) to a $cis$-alkene (cis$-2-$butene) requires a partial reduction that involves $syn$-addition of

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$H_2, Pd / C, 	ext{quinoline}$

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(B) The conversion of an internal alkyne (but$-2-$yne) to a $cis$-alkene (cis$-2-$butene) requires a partial reduction that involves $syn$-addition of hydrogen.This is achieved using Lindlar's catalyst,which is $Pd$ supported on $CaCO_3$ or $BaSO_4$ poisoned with quinoline or lead acetate $(H_2, Pd / C, 	ext{quinoline})$.$Na / 	ext{liquid } NH_3$ (Birch reduction) would result in the $trans$-alkene.Therefore,the correct reagent is $H_2, Pd / C, 	ext{quinoline}$.

The most suitable reagent for the following conversion is:
$H_3C-C \equiv C-CH_3 \rightarrow \text{cis-2-butene}$

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The most suitable reagent for the following conversion is:$H_3C-C \equiv C-CH_3 \rightarrow \text{cis-2-butene}$