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B
5-formylhex-2-oxohex-2-en-5-al
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C
5-methyl-4-oxohex-2-en-5-al
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D
3-keto-2-methylhex-5-enal
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Solution
The correct option is A 3-keto-2-methylhex-4-enal Aldehydes get higher priority over ketone and alkene in the numbering of principal C-chain. ∴ 3-keto-2-methylhex-4-enal will be the IUPAC name