In the given reactions,identify A and B. | vedclass

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(A) $1$. The first reaction is the catalytic hydrogenation of an alkyne using $Pd/C$ (Lindlar's catalyst is typically poisoned,but $Pd/C$ generally re

Vedclass · Accepted Answer

$A$: $2$-Pentyne,$B$: trans-$2$-butene

Vedclass · Answer

(A) $1$. The first reaction is the catalytic hydrogenation of an alkyne using $Pd/C$ (Lindlar's catalyst is typically poisoned,but $Pd/C$ generally reduces alkynes to alkenes). The product shown is a cis-alkene,specifically $cis$-$3$-methylpent-$2$-ene (or similar structure based on the image). Looking at the reactant $A$ in the image,it is $CH_3-C\equiv C-C_2H_5$,which is $2$-pentyne.$2$. The second reaction is the Birch reduction of an internal alkyne ($CH_3-C\equiv C-CH_3$,which is but-$2$-yne) using $Na/	ext{liquid } NH_3$. This reaction is stereospecific and yields the trans-alkene,which is trans-$2$-butene.$3$. Therefore,$A$ is $2$-pentyne and $B$ is trans-$2$-butene.

In the given reactions,identify $A$ and $B$.

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