The correct IUPAC name of the given compound is

5-carboxy-3-oxocyclohexancarbaldehyde

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2-carboxy-5-formylcyclohexanone

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4-carboxy-3-oxocyclohexane

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4-formyl-2-oxocyclohexanecarboxylic acid

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Solution

The correct option is D 4-formyl-2-oxocyclohexanecarboxylic acid
In the given compound, we have carboxylic acid, aldehyde and ketone group. In this carboxylic acid is the priority one. Hence, numbering should start from the carboxylic group.
Thus, the IUPAC name of the compound is
4-formyl-2-oxocyclohexanecarboxylic acid

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