How many structural isomers are there of C₄H₁₀ A) 4 B) 6 C) 2 D) 8 E) 10

Question

Quizplus · Accepted Answer

The molecule contains 6 sulfur atoms and 14 carbon atoms. Since all the sulfur atoms are connected to either carbon or hydrogen, the total number of bonds for sulfur atoms is either 2 or 3. 
If sulfur makes 2 bonds, we have 6*2=12 bonds for sulfur atoms, and thus there are 2 bonds left for the remaining carbon atoms. Therefore, we have only one structural isomer for this case.
If sulfur makes 3 bonds, we have 6*3=18 bonds for sulfur atoms, which means we need to have 4 carbon atoms to satisfy the valency requirements. The remaining 10 carbon atoms are then connected to each other in different ways, giving rise to another structural isomer. 
Thus, the total number of structural isomers is 2.

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How Many Structural Isomers Are There of C₄H₁₀