I've been playing around with ChemDraw and found that it assigns the priorities of substituents in a way I wouldn't have expected, depending on the length of the alkyl substituent. I'm not a nomenclature buff, so I'd like to know if it's correct and if so, why.
- $n = 1$: 1-ethyl-2-iodobenzene
- $n = 2$: 1-iodo-2-propylbenzene
- $n = 3$: 1-butyl-2-iodobenzene
- $n = 4$: 1-iodo-2-pentylbenzene
What determines the priorities of the alkyl group and the iodo group?
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