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(D) $1$. Identify the principal functional group: The aldehyde group $(-CHO)$ has the highest priority,so the parent chain must include it and start n

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$2-$ethyl$-5-$hydroxy$-3-$methylhept$-3-$enal

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(D) $1$. Identify the principal functional group: The aldehyde group $(-CHO)$ has the highest priority,so the parent chain must include it and start numbering from the carbonyl carbon as $C-1$.$2$. Select the longest carbon chain containing the principal functional group and the double bond: The longest chain containing the $-CHO$ group and the $C=C$ bond has $7$ carbon atoms (heptenal).$3$. Numbering the chain: Starting from the aldehyde carbon $(C-1)$,the double bond starts at $C-3$,the methyl group is at $C-3$,the hydroxyl group is at $C-5$,and the ethyl group is at $C-2$.$4$. Assemble the name: Alphabetical order for substituents is ethyl,hydroxy,methyl. Thus,the name is $2-$ethyl$-5-$hydroxy$-3-$methylhept$-3-$enal.

The $IUPAC$ name of the given compound is

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