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This question already has an answer here:

Why is the ring numbered the way it is? What is it about the double bond that makes it so?

molecule

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marked as duplicate by Loong nomenclature Jun 13 at 16:24

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Acoording to the IUPAC rules for nomenclature of the halo compounds the $\ce{Cl}$ here is treated like $\ce{CH3}$. And also according to rule, the double bond have preference over the groups other than functional groups.

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