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The IUPAC name of CH3 – CH – CH = C – CHO | OH CH3

1. 4-Hydroxy-1-methylpentanal
2. 4-Hydroxy-2-methylpent-2-en-1-al
3. 2-Hydroxy-4-methylpent-3-en-5-al
4. 2-Hydroxy-3-methylpent-2-en-5-al

Correct answer: 4-Hydroxy-2-methylpent-2-en-1-al

Solution

The longest chain contains 5 carbon atoms with an aldehyde group (-CHO) at one end. The double bond is at position 2, and the hydroxyl (-OH) group is at position 4. The methyl group is at position 2. Thus, the correct IUPAC name is 4-Hydroxy-2-methylpent-2-en-1-al.

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