Which compound is Z but not cis? | vedclass

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(B) To determine the $Z$ configuration,we use the Cahn-Ingold-Prelog $(CIP)$ priority rules. $A$ compound is $Z$ if the groups with higher priority ar

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(B) To determine the $Z$ configuration,we use the Cahn-Ingold-Prelog $(CIP)$ priority rules. $A$ compound is $Z$ if the groups with higher priority are on the same side of the double bond.$A$: The groups are $H$ (priority $2$) and $COOH$ (priority $1$) on the left carbon,and $HOOC$ (priority $1$) and $OH$ (priority $2$) on the right carbon. The higher priority groups ($COOH$ and $OH$) are on opposite sides,so this is $E$.$B$: The groups are $CH_3$ (priority $2$) and $Cl$ (priority $1$) on the left carbon,and $Cl$ (priority $1$) and $CH_2-CH_3$ (priority $2$) on the right carbon. The higher priority groups ($Cl$ and $Cl$) are on the same side,so this is $Z$. Since the groups are not identical,it cannot be $cis/trans$.$C$: This is $cis-1,2-dibromoethene$,which is $Z$.$D$: The groups are $CH_3$ (priority $2$) and $D$ (priority $1$) on the left carbon,and $H$ (priority $2$) and $D$ (priority $1$) on the right carbon. The higher priority groups ($D$ and $D$) are on the same side,so this is $Z$. However,the groups on each carbon are different,so it is not $cis$.Comparing $B$ and $D$,$B$ is a more standard example of a $Z$ isomer that is not $cis/trans$ due to the lack of identical groups on the carbons.

Which compound is $Z$ but not $cis$?

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