Question

Name this structure
http://session.masteringchemistry.com/problemAsset/1165300/3/11d.jpg

Answer 1

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Answer 2

Pent-2-ene.

Answer 3

howd u know that it isnt 2-pentene ?

Answer 4

There are internationally accepted standards for nomenclature, for alkenes, we just happen to put the number of the unsaturated bond(s) directly after the prefix for the number of carbons.