Which of these has no structural isomers?

Question

Quizplus · Accepted Answer

In order to have structural isomers, a compound must have different arrangements of atoms. The only variable atoms in these compounds are the sulfur atoms. A and D have different numbers of sulfur atoms, so they must have structural isomers. B has two sulfur atoms that are not bonded to anything else, allowing for different arrangements. C has only one sulfur atom that is not bonded to anything else, meaning there can be no structural isomers.

Which of These Has No Structural Isomers