Priority in Numbering Methyl and Ethyl

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Priority in Numbering Methyl and Ethyl

Postby Paola_RubioRod_1F » Thu Mar 16, 2017 1:20 am

Hello all,

I have two questions regarding prioritization of numbering substituents and functional groups.
1) Where do double and triple bonds get ranked in regards to numbering?
2) Where do substituent groups like methyl and ethyl get ranked among all functional groups as well as alkenes and alkynes?

Thank you.

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Joined: Wed Sep 21, 2016 2:55 pm

Re: Priority in Numbering Methyl and Ethyl

Postby stephanieyang_3F » Thu Mar 16, 2017 9:30 am

For priority it's usually:
1. Functional groups
2. Alkenes/alkynes
3. Halides and Alkyl substituents
If there are two substituents that have the same "priority" like for example, "bromo" and "chloro", you want to name it to whatever will give you the lowest number. If they are equal (like lets say they're both on the 2nd carbons relative to the end of each side) then you assign the lowest number to whatever comes first in the name. Hope this helps!

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