A compound with a molecular formula C 9 H 12 has the following 1 H NMR spectrum. Which of the following structures is consistent with this spectrum?

Question

Quizplus · Accepted Answer

The ^{1 signal at 8.5 ppm indicates the presence of a proton attached to an sp carbon, which is most likely attached to the sulfur atom. The}H signal at 1-2 ppm is consistent with a methyl group attached to a sulfur atom. Therefore, structure III (a thiophene with a methyl group) is consistent with the NMR spectrum. Structures I and IV have no methyl group attached to a sulfur atom, and structure II has the sulfur atoms bonded to carbons that are not sp hybridized.

A Compound with a Molecular Formula C9H12 has the Following

A Compound with a Molecular Formula C₉H₁₂has the Following