Which of the following compounds among 2,3-dimethylpentane, 3-ethylpentane, and 3-methylhexane are constitutional isomers of heptane?

Which of the following compounds among 2,3-dimethylpentane, 3-ethylpentane, and 3-methylhexane are constitutional isomers of heptane?
A) only 2,3-dimethylpentane and 3-ethylpentane
B) only 2,3-dimethylpentane and 3-methylhexane
C) only 3-ethylpentane and 3-methylhexane
D) all of these


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