Which of the following represents an incorrec | vedclass

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(D) According to $IUPAC$ nomenclature rules for unsaturated hydrocarbons containing both double and triple bonds:$1$. The principal chain must contain

Vedclass · Accepted Answer

$CH\equiv C-CH=CH-CH_2-CH=CH_2$ (Hepta$-1,6-$dien$-3-$yne)

Vedclass · Answer

(D) According to $IUPAC$ nomenclature rules for unsaturated hydrocarbons containing both double and triple bonds:$1$. The principal chain must contain both multiple bonds if possible.$2$. Numbering is done to give the lowest possible locant set to the multiple bonds.$3$. If there is a tie in the locant set, the double bond is given preference for the lower number.Analysis:- Option $A$: Numbering from left gives locants $1$ (ene) and $5$ (yne). Correct.- Option $B$: Numbering from right gives locants $1$ (yne) and $5$ (ene). Correct.- Option $C$: Numbering from left gives locants $1, 4$ (enes) and $6$ (yne). Correct.- Option $D$: The structure $CH\equiv C-CH=CH-CH_2-CH=CH_2$ numbered from left gives locants $1$ (yne) and $3, 6$ (enes). The locant set is $(1, 3, 6)$. If numbered from right, it gives $1, 4, 6$. Since $1, 3, 6 < 1, 4, 6$, the correct name is Hepta$-1,6-$dien$-3-$yne. The provided option label in the original question was incorrect/ambiguous.

Which of the following represents an incorrect numbering of the carbon chain according to $IUPAC$ rules?

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