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Don't double bonds take prefferance over alkyl groups in the lowest number order thing (where you start the numbers for naming)?  This seems odd, given that you put the alkyl group in first (prefix)!

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1 Answer

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To name carbon compounds with double bonds (alkenes), you should indicate the position of this double bond in the name itself.

Example 1: Butene with a double bond between C1 and C2 will be named as 1-butene or but-1-ene

Example 2: Now there's a chlorine atom on the C3 atom. It will be named as 3-chloro-but-1-ene or 3-chloro-1-butene

And yes, double bonds will take preference in lowest numbering. Meaning that we want 3-chloro-1-butene and not 2-chloro-3-butene.

We put the alkyl group first in the naming because that's according the IUPAC rules.

Hope this makes sense!

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