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Naming

Posted: Sun Mar 05, 2017 11:10 pm
by Nayeon Kang 2M
For the organic molecules at pg 92, why can't we say it's 5-Ethyl-3-Methyl-Heptane?

Re: Naming

Posted: Sun Mar 05, 2017 11:19 pm
by Ana Ordonez 1G
We can't name it 5-ethnyl-3-methyl-heptance because when numbering the carbons in the longest hydrocarbon chain, the carbons have the same numbers going from right to left and left to right. In this case we look at the names of the substituent and whichever comes first alphabetically, that is the one that will get the lowest number. Ethyl comes first so we will number the carbons from left to right making methyl on 5.