What is the name for this molecule? nonene nonane 1-octyne 1-octene

The name of the given molecule is  1-octene

1) We will number the carbon chain in such a way that so that smallest number should reside on the carbon atom with double bond. By numbering we the chain we can see that carbon with double are given with number '1'.

2) Now we will count the number of carbon atoms in a given chain. There are 8 carbon atoms present in the given molecule.

According to IUPAC naming of organic molecules :

1) First write the number on which double bond is present. Here is number '1' like this '1-'.

2) After this write the prefix which will tell us about the number of total carbon atoms present in the chain followed by suffix 'ene'(suffix used for hydrocarbon with one double bond). Here there are 8 carbon atoms and prefix for eight carbon atoms is 'octa'

So, the name of the given molecule is : 1-octene