Answer
The systematic name for Cumene is:
isopropylbenzene or 2-phenylpropane
Work Step by Step
We can see from the structure of cumene that one isopropyl group is present as a single substituent at the benzene ring. So, the systematic name will be isopropylbenzene.
Also, we can name it in different way. We can imagine benzene ring as a substituent (Phenyl group) which is present at C2 position of the aliphatic 3 Carbon chain. i.e. root name is prop; ending name is 'ane' and prefix is '2-phenyl'. So, the complete name is 2-phenylpropane.
