What are the structural isomers of heptane? The nine isomers of heptane are: Heptane (n-heptane) 2-Methylhexane (isoheptane) 3-Methylhexane. 2,2-Dimethylpentane (neoheptane) 2,3-Dimethylpentane. 2,4-Dimethylpentane. 3,3-Dimethylpentane. 3-Ethylpentane. How…