The IUPAC nomenclature priority for alkyl groups on a parent chain is determined by the alphabetical order of the groups.

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The priority for alkyl groups on a parent chain is determined by their size or number of carbons, with larger or more complex groups having higher priority. Alphabetical order is only used as a tie-breaker when two or more groups have the same size or complexity.

The IUPAC Nomenclature Priority for Alkyl Groups on a Parent