A) 3-keto-2-methylhex-5-enal
B) 3-keto-2-methylhex-4-enal
C) 5-formylhex-2-en-3-one
D) 5-methyl-4-oxohex-2-en-5-al
Correct Answer: B
Solution :
[b]
Aldehydes get higher priority over ketone and alkene in numbering of principal C-chain. 
- keto-2-methylhex-4-enal
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