Quick question about organic chem

[Over9000]

just a quick Q u know when u have functional groups and a double bond
 and u gotta find the longest Carbon chain
 and theres a functional group on the very left but a double bond on the very right
 its the functiona group takes precendant over the double bond yeah?

[pHysiX]

hmmm is this possible? i thought wen there are double bonds between Carbons, then there will be some sort of addition reaction...well that's my thought *thinks hard*

[Collin Li]

Actually, I Google'd this because I wasn't 100% sure.

The bottom of this page conflicts with itself:
http://elchem.kaist.ac.kr/jhkwak/OkanaganPdb97/nomenclature/ane-610.htm

Example 6 illustrates that the functional group named as a prefix takes precedence in the numbering system and is given the lowest possible number.

But that example puts "bromo" as number 12.

[Over9000]

Thanks coblin

[pHysiX]

hmmm, from that same site:

http://elchem.kaist.ac.kr/jhkwak/OkanaganPdb97/nomenclature/ane-720.htm

look at pent-3-yn-1-ol. triple bond on the left, n functional group at end. and refer to the example above it for pent-4-en-1-ol. i think that's it =]