Shouldn't this be 2-methyl propane?

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1 Answer
Feb 2, 2018

No, it is Methylpropene

Explanation:

First, we take a look at the main chain.
It is a propene, not a propane, chain, because it has a double bond. You do not need to specify the location of the double bond, because it only has one possible location.

Now the side chain.
It is a methyl-group, because it is one carbon atom long, but you do not need to specify the location of this side group, because it can only be attached to the second carbon atom of the main chain. Therefore, this is a methyl-propene molecule.