QUESTION IMAGE
Question
what is the iupac name of this compound? 5-ethyl-4-methyl-4-heptene 3-ethyl-4-methyl-3-hexene 3-ethyl-4-methyl-4-heptene 3-ethyl-4-methyl-3-heptene 3-ethyl-4-propyl-2-pentene
Brief Explanations
- Identify the parent chain: The longest carbon chain containing the double bond. Let's count the carbons: the chain with the double bond has 7 carbons (heptene).
- Number the parent chain: Number to give the double bond the lowest number. The double bond is between carbons 3 and 4? Wait, no—wait, let's look at the structure. Wait, the double bond: let's draw the structure. The main chain: let's see the substituents. Wait, the correct numbering: the double bond is at carbon 3? Wait, no, let's re - examine. Wait, the parent chain is 7 carbons (heptene). Let's number from the end closest to the double bond. Wait, the double bond: let's see the positions. Wait, the substituents: ethyl at carbon 3, methyl at carbon 4, and the double bond between carbon 3 and 4? Wait, no, wait. Wait, the correct IUPAC naming: parent chain length, double bond position, substituents. Let's check each option:
- For the parent chain: 7 carbons (heptene). So eliminate options with hexene or pentene. So eliminate "3 - ethyl - 4 - methyl - 3 - hexene" and "3 - ethyl - 4 - propyl - 2 - pentene".
- Now, numbering: the double bond should get the lowest number. Let's number the chain. Let's assume the chain is C1 - C2 - C3 - C4 = C5 - C6 - C7? No, wait, maybe I got the numbering wrong. Wait, the correct structure: let's see the given structure. The double bond is between carbon 3 and 4? Wait, no, let's look at the substituents. The ethyl is at carbon 3, methyl at carbon 4, and the double bond is between carbon 3 and 4? Wait, no, the correct name: "3 - ethyl - 4 - methyl - 3 - heptene". Wait, no, wait. Wait, when numbering, the double bond has priority. Let's number the chain so that the double bond has the lowest possible number. Let's count the carbons in the parent chain: 7 (heptene). Let's number from the left: C1 - C2 - C3 - C4 = C5 - C6 - C7? No, that would make the double bond at 4. Wait, no, maybe the other end. Let's number from the right: C7 - C6 - C5 - C4 = C3 - C2 - C1. Then the double bond is at 3 - 4? Wait, no, I think I messed up. Wait, the correct option is "3 - ethyl - 4 - methyl - 3 - heptene"? Wait, no, wait. Wait, let's check the options again. The correct parent chain is 7 carbons (heptene). The double bond: let's see the position. The substituents: ethyl at 3, methyl at 4. The double bond is between 3 and 4? Wait, no, the double bond is at carbon 3 - 4? Wait, the name "3 - ethyl - 4 - methyl - 3 - heptene" has the double bond at 3 (since it's 3 - heptene), ethyl at 3, methyl at 4. Wait, but if the double bond is at 3, then the numbering is such that the double bond is at the lowest possible number. Let's confirm:
- Parent chain: 7 carbons (heptene).
- Double bond position: number the chain so that the double bond gets the lowest number. Let's number from the end where the double bond is closer. If we number from the left, the double bond is at carbon 4 (4 - heptene), but if we number from the right, the double bond is at carbon 3 (3 - heptene). So we number from the right. Then, the substituents: ethyl at carbon 3, methyl at carbon 4. So the name is 3 - ethyl - 4 - methyl - 3 - heptene. Wait, but let's check the options. The option "3 - ethyl - 4 - methyl - 3 - heptene" is one of the choices. Wait, no, wait the option is "3 - ethyl - 4 - methyl - 3 - heptene"? Wait, the options are:
- 5 - ethyl - 4 - methyl - 4 - heptene
- 3 - ethyl - 4 - methyl - 3 - hexene
- 3 - ethyl - 4 - methyl - 4 - heptene
- 3 - ethyl - 4 - methyl - 3 - heptene
- 3 - ethyl - 4 - propyl - 2 - pentene
So by e…
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3 - ethyl - 4 - methyl - 3 - heptene