What is the IUPAC name of the given compound? | vedclass

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(B) $1$. Identify the longest carbon chain containing the double bond. The chain has $5$ carbons,so it is a $pentene$ derivative.$2$. Number the chain

Vedclass · Accepted Answer

$cis-2-chloro-3-iodo-2-pentene$

Vedclass · Answer

(B) $1$. Identify the longest carbon chain containing the double bond. The chain has $5$ carbons,so it is a $pentene$ derivative.$2$. Number the chain to give the double bond the lowest possible position. Numbering from left to right gives the double bond at position $2$.$3$. Substituents are $chloro$ at position $2$ and $iodo$ at position $3$. Thus,the base name is $2-chloro-3-iodo-2-pentene$.$4$. Determine the configuration ($cis$ or $trans$). On the left carbon $(C2)$,the higher priority group is $Cl$ $(Z=17)$ vs $CH_3$ $(Z=6)$. On the right carbon $(C3)$,the higher priority group is $I$ $(Z=53)$ vs $CH_2CH_3$ $(Z=6)$.$5$. Since the higher priority groups ($Cl$ and $I$) are on the same side of the double bond,the configuration is $cis$ (or $Z$).$6$. Therefore,the correct name is $cis-2-chloro-3-iodo-2-pentene$.

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