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Postby Taylor_Lam_1E » Sun Mar 19, 2017 10:16 am

When it comes to numbering alkanes, does it matter where you start? Like in question 5C on quiz 3, where it was a cyclobutane with ethyl and methyl substituents, what would be the 1 and what would be the 3?

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Re: Numbering

Postby Cherry_Deng_1K » Sun Mar 19, 2017 10:51 am


It does matter where you start numbering the carbons. In this case, you would want to assign lower numbers alphabetically. Since E comes before M, you would assign the lower number to ethyl and the higher number to methyl. Therefore, the name of the hydrocarbon would be 1-ethyl-3-methyl cyclobutane.

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