Which of the following properties are not identical for constitutional isomers?
I. molecular formula
II. molecular weight
III. order of attachment of atoms
IV. physical properties

Question

Quizplus · Accepted Answer

Constitutional isomers have the same molecular formula but different order of attachment of atoms. Therefore, I is identical for all constitutional isomers. Similarly, molecular weight is determined by the molecular formula, so II is also identical for all constitutional isomers. On the other hand, III is different for constitutional isomers because they have a different order of attachment of atoms. Lastly, physical properties such as melting point, boiling point, and solubility may be different for constitutional isomers because they have different structures, so IV is also not identical for constitutional isomers. Therefore, the correct answer is D.

Which of the Following Properties Are Not Identical for Constitutional