Given the Compounds 2,3-Dimethylpentane, 3-Ethylpentane and 3-Methylhexane, Which Are Constitutional

Multiple Choice

Given the compounds 2,3-dimethylpentane, 3-ethylpentane and 3-methylhexane, which are constitutional isomers of one another?

A) only 2,3-dimethylpentane and 3-ethylpentane
B) only 2,3-dimethylpentane and 3-methylhexane
C) only 3-ethylpentane and 3-methylhexane
D) They are all constitutional isomers of one another.