Structure of 4-Methylpent-2-enal is : - DASH

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Structure of 4-Methylpent-2-enal is :

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Step-by-Step Explanation Step 1: Determine the Parent Chain The name "pent" indicates a five-carbon parent chain. Because the compound is an aldehyde (indicated by the suffix "al"), the aldehyde carbon must be at position 1. Step 2: Number the Chain from the Aldehyde End Assign carbon 1 to the aldehyde group. Thus, the chain can be enumerated as: C1(CHO) – C2 – C3 – C4 – C5 Step 3: Locate and Insert the Double Bond "Pent-2-enal" means there is a double bond starting at carbon 2. Hence, the double bond is between C2 and C3: CHO–CH=CH–C4–C5 Step 4: Add the Methyl Substituent The name "4-methyl" tells us there is a methyl group attached at carbon 4. This modifies C4 to include the substituent: CHO–CH=CH–CH(CH3)–CH3 Step 5: Confirm the Final Structure We have five carbons in the main chain, an aldehyde at carbon 1, a double bond between carbons 2 and 3, and a methyl substituent at carbon 4. This is consistent with the IUPAC name 4-methylpent-2-enal. The correct structure is:

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