Which one of the following structures has the | vedclass

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(D) To determine the structure,we analyze the $IUPAC$ name: $3$-ethynyl-$2$-hydroxy-$4$-methylhex-$3$-en-$5$-ynoic acid.$1$. The parent chain is a hex

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(D) To determine the structure,we analyze the $IUPAC$ name: $3$-ethynyl-$2$-hydroxy-$4$-methylhex-$3$-en-$5$-ynoic acid.$1$. The parent chain is a hexenoic acid ($6$ carbons,carboxylic acid at $C-1$,double bond at $C-3$).$2$. There is a hydroxy group at $C-2$.$3$. There is an ethynyl group $(-C \equiv CH)$ at $C-3$.$4$. There is a methyl group at $C-4$.$5$. There is a triple bond at $C-5$ ($-C \equiv CH$ group at $C-5$ position in the chain).Comparing this with the given options,structure $D$ correctly represents the connectivity where the carboxylic acid is at $C-1$,hydroxy at $C-2$,ethynyl at $C-3$,and the methyl group and the remaining alkyne chain are at $C-4$ and $C-5$ respectively.

Which one of the following structures has the $IUPAC$ name $3$-ethynyl-$2$-hydroxy-$4$-methylhex-$3$-en-$5$-ynoic acid?

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