Of the given compounds, which compound is not a constitutional isomer of the other three compounds? 2,3-dimethylpentane, 3-ethylpentane, 2,2-dimethylbutane, and 3-methylhexane
A) 2,3-dimethylpentane
B) 3-methylhexane
C) 3-ethylpentane
D) 2,2-dimethylbutane

Question

Quizplus · Accepted Answer

Constitutional isomers have the same molecular formula but differ in the connectivity of their atoms. 2,3-dimethylpentane, 3-ethylpentane, and 3-methylhexane all have the molecular formula C7H16 and differ only in the connectivity of their carbon atoms. However, 2,2-dimethylbutane has the same molecular formula but a different connectivity that does not match the pattern of branching found in the other three, making it not a constitutional isomer of the others.

Of the Given Compounds, Which Compound Is Not a Constitutional