My book names this compound as 6-ethyl-5-methylcyclohex-2-en-1-one.
I have learnt that after numbering the principal functional group which is ketone in this case, we have to treat all other groups as substituents and therefore I think the name should be 2-ethyl-3-methylcyclohex-5-en-1-one.
Why should the double bond be given priority?
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