2.16 Intro to Ochem chapter 2

[Michelle_Tan_1G]

It asks you to name the haloalkene, which has a chlorine and fluorine atom attached to the end of a propene atom. However, when prioritizing which atom to list first (Cl vs F) do we look at atomic number or alphabetical order? The answer is 3-chloro-3-fluoro-1-propene.

[Patrick_Mac_3D]

I believe you look at atomic number.

[Michelle_Tan_1G]

ok, thanks! does that only apply to haloalkenes? In what case would you look at alphabetical order?

[Emily Wang 1H]

When naming substituents (whether they are alkyl groups or halogens), I think we are supposed to follow the alphabetical rule. The last two pages of this link explain it: https://www.utdallas.edu/~scortes/ochem/OChem1_Lecture/Class_Materials/07_org_nomenclature1.pdf.