What is the name of this molecule?

ch2 - ch2 - ch3
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ch3 - ch2 - ch - ch2 - ch = ch3

It is a linear chain.

It has one double bond, so it is an alkene

It has 9 carbon atoms, so it is a nonene.

Number the carbons so that the double bond is the closer to the first carbon.

As the double bond is in the first carbon, you name it 1-nonene.

1-nonene