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You take the lowest number carbon from the outside of the molecule to determine the prefix, whether this be the left hand side or the right hand side. e.g.
C-C-C=C-C
is the same isomer as:
C-C=C-C-C
Both are 2-pentene.
The double bond on the third carbon will always be between a carbon that is closer to the end of the molecule (therefore lower in number), so it is this carbon that will dictate the prefix.
Therefore the only 2 isomers of Pentene are 1-pentene and 2-pentene.
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∙ 13y ago
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