Name the Alkene? (Image linked)?

ArturoGonzales

New member
http://www.users.muohio.edu/taylorrt/courses/CHM231ExamOne_files/image008.gif

The alkene I have is identical to that, but without the extra methyl group at the right (it's pentene instead of hexene).

Can someone help naming it for me?
I got: 3-Ispropyl-2-Pentene, but I realize it can also be 4-methyl-3-propyl-2-pentene. Which is correct?

And does this have (E)/(Z) conformation? I didn't think so, but I'm not too sure.
 
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