Hexane and 2-methylpentane are constitutional isomers. Which of the following statements is true of these isomers?
A) Hexane and 2-methylpentane have the same melting point.
B) Hexane and 2-methylpentane have the same boiling point.
C) Hexane and 2-methylpentane have the same molecular formula.
D) Hexane and 2-methylpentane have the same molecular structure.

Question

Quizplus · Accepted Answer

Hexane and 2-methylpentane have different molecular structures because they are constitutional isomers. However, they do have the same molecular formula because they both have the same number of carbon and hydrogen atoms. Therefore, choice C is the correct answer. Choices A and B are false because melting point and boiling point are properties that depend on molecular structure and intermolecular interactions, which differ between hexane and 2-methylpentane. Choice D is false because, as stated earlier, hexane and 2-methylpentane have different molecular structures.

Hexane and 2-Methylpentane Are Constitutional Isomers