Identifying Skeletal Structures for Hepta-3,6-dien-1-yne
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Q1 Which of the following is an acceptable structure of Hepta-3,6-dien-1-yne?
(i) [Skeletal structure with triple bond at C1, double bond at C3 and C6]
(ii) [Skeletal structure with double bond at C1, triple bond at C3, double bond at C6]
(iii) [Skeletal structure with triple bond at C1, double bond at C4, double bond at C6]
(iv) [Skeletal structure with triple bond at C2, double bond at C4, double bond at C6]
(A) 1 and 3 both
(B) 1 only
(C) 4 only
(D) 2 and 4 both
This question includes visual content: The image presents four skeletal chemical structures labeled (i), (ii), (iii), and (iv). (i) Shows a 7-carbon chain with a triple bond starting at carbon 1, a double bond across carbons 3-4, and another double bond across carbons 6-7. (ii) Shows a 7-carbon chain with a double bond at carbon 1, a triple bond at carbon 3, and a double bond at carbon 6. (iii) Shows a 7-carbon chain with a triple bond starting at carbon 1, a double bond at carbon 4, and a double bond at carbon 6. (iv) Shows an 8-carbon chain with a triple bond at carbon 2 and double bonds at positions 4 and 6. Below these structures are multiple-choice options lettered A through D.
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Step by Step Written Solution
Hi Ziwww, let's solve this chemistry question together. We need to identify the correct structure for Hepta-three-six-dien-one-yne.
IUPAC Name Analysis
First, let's break down the name. The root word hepta refers to a seven-carbon main chain.
The suffix three-six-di-ene indicates there are two double bonds starting at carbon three and carbon six.
And the suffix one-yne means there is a triple bond starting at position one.
Now, let's look at structure one. We start numbering from the end closest to the triple bond to give it the lowest possible locant. Carbon one has the triple bond.
Evaluating Structure (i)
In this structure, the triple bond is at carbon one, a double bond begins at carbon three, and another double bond begins at carbon six. This matches our requirements perfectly.
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