How many noncyclic isomers including geometric isomers of C₄H₈ exist? A)1 B)2 C)3 D)4 E)5

Question

Quizplus · Accepted Answer

There are two different possibilities for the placement of the two sulfur atoms in the molecule: they can either be next to each other or separated by a carbon atom. 1) If the two sulfur atoms are next to each other (connected by a single bond), then the other sulfur atom and the two nitrogen atoms must be separated, as they all have a high electron density and would repel each other. This arrangement results in a linear molecule with no geometric isomers. 2) If the two sulfur atoms are separated by a carbon atom, then the molecule has a branched structure. There are four possible arrangements of the other atoms around the central carbon, giving rise to four possible geometric isomers. Therefore, there are a total of 1 + 4 = 5 noncyclic isomers including geometric isomers of C₄H₈. However, we need to subtract one of the isomers from the count since it actually contains a cyclic structure. This leaves us with a total of 4 noncyclic isomers including geometric isomers.

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How Many Noncyclic Isomers Including Geometric Isomers of C₄H₈ Exist