Question

Structure of 4-Methylpent-2-enal is

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is D

Naming the Structure: The name “4-Methylpent-2-enal” provides the key structural features of the molecule. The “pent” indicates a five-carbon chain. “2-enal” indicates the presence of a double bond at the second carbon and an aldehyde group at the terminal position. The “4-methyl” substituent specifies a methyl group attached to the fourth carbon.

Construct the Structure Step-by-Step:
Step 1: Place a five-carbon chain.
Step 2: Insert a double bond between carbons 2 and 3.
Step 3: Attach an aldehyde group (C=O with an H) to the first carbon.
Step 4: Add a methyl group to the fourth carbon.

Verify Each Option: Only Option (4) matches this structure, with the correct placement of the double bond, aldehyde group, and methyl substituent.

Conclusion: The structure in Option (4) is correct for 4-Methylpent-2-enal.