In the given molecule of 5-isopropyl-2-methyl-3-nonene their are nine carbon atom attached in straight chain.3-nonene means that double bond is between the third carbon and forth carbon atom.Isopropyl group on the fifth carbon atom in the chainMethyl group on second carbon atom in the chain.
Th structure of the given organic molecule is attached as an image.
(included in attachment photo)
See the attached file
The classifications of the carbon as primary secondary tertiary and quaternary depends on the number of the carbon atoms attached to a carbon. In case, the carbon is attached to a single carbon, then it is referred as primary carbon. If the carbon is attached to two carbons, then it is referred as the secondary carbon, if the carbon is attached to three carbons then it is referred as tertiary, and if the carbon forms all the bond with another carbon atom then it is referred as quatenary carbon.
The given below is the picture showing the primary, secondary, tertiary, and quarternary carbons in 4-isopropyl-2,4,5-trimethylheptane: