What does the number prefix tell you in the name of an alkene?

1 Answer
anor277
Sep 9, 2016

The number relates to the position of the olefin, the double bond, along the carrbon chain.

Explanation:

#"1-butylene"# or #"1-butene"# is #H_2C=CHCH_2CH_3#; #"2-butene"# is #H_3C-CH=CHCH_3#, which comes in two geometric forms. Can I have a #"3-butene"#?

What is #"2-pentene"#?

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