The given structure has the IUPAC name: | vedclass

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(C) $1$. Identify the parent chain: The parent chain is a cyclohexane ring.$2$. Identify substituents: There is an ethyl group $(-CH_2CH_3)$ and two m

Vedclass · Accepted Answer

$3-$Ethyl$-1,1-$dimethylcyclohexane

Vedclass · Answer

(C) $1$. Identify the parent chain: The parent chain is a cyclohexane ring.$2$. Identify substituents: There is an ethyl group $(-CH_2CH_3)$ and two methyl groups $(-CH_3)$ attached to the ring.$3$. Numbering the ring: According to $IUPAC$ rules,we number the ring to give the lowest possible locants to the substituents. If we start numbering from the carbon with the two methyl groups as $1$,the substituents are at positions $1, 1,$ and $3$. If we start from the carbon with the ethyl group as $1$,the substituents are at $1, 3,$ and $3$.$4$. Alphabetical order: Ethyl comes before methyl. Comparing the sets of locants $(1, 1, 3)$ vs $(1, 3, 3)$,the set $(1, 1, 3)$ is lower. However,we must also consider alphabetical priority when the locant sets are different. Assigning $1$ to the carbon with the ethyl group gives the name $1-$ethyl$-3,3-$dimethylcyclohexane. Assigning $1$ to the carbon with the two methyl groups gives $3-$ethyl$-1,1-$dimethylcyclohexane. Comparing the locants,$1, 1, 3$ is preferred over $1, 3, 3$. Therefore,the correct name is $3-$ethyl$-1,1-$dimethylcyclohexane.

The given structure has the $IUPAC$ name:

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