Answer:
The molecule which is given on right side is Hexane which is the hydrocarbon and the molecule on left side is not hydrocarbon as it also contains Florine and iodine.
Step-by-step explanation:
CH3+CH2+CH2+CH2+CH2+CH3 (Hexane):
Hydrocarbon are those compounds which contains only carbon and hydrogen. In above given example; Hexane there are only C and Hydrogen.
Benzene molecule is also Hydrocarbon without the substitution. Here in this molecule, due to the substitution it is not hydrocarbon.