Quiz 3 Prep pg 43 question 5

[BrandonCooper2C]

The answer says 3-bromo-1-iodocyclohexane, but I got 1-bromo-3-iodocyclohexane because I thought you are supposed to give the lower number to the first alphabetical substituent when the numbers are the same either way.

Please help.

[Cindy Chen_2I]

You give priority to the I because it has a larger atomic number.

[Cindy Chen_2I]

You give the lower number to the first alphabetical substituent only when the two substituents are connected by the same kind of atom. For example, in 1-ethyl-2-methylcyclopentane, you give the one to the alphabetically first substituent because they are both connected by a C atom (when you go down the side chain, the first thing you encounter is a C).

[Cindy Chen_2I]

You give priority to the I because it has a larger atomic number.

Oh I'm sorry they say the workbook gave the wrong answer, so your answer is correct as it is.