GK QUESTION#3276
Identify the aromatic heterocycles represented by these source structures.
a. A five-membered aromatic ring containing one oxygen atom.
b. A six-membered aromatic ring containing one nitrogen atom.
c. A five-membered aromatic ring containing one sulfur atom.
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Answer
B. a: Furan, b: Pyridine, c: Thiophene
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Explanation
The three source drawings show, respectively, a five-membered aromatic ring with one oxygen atom (furan), a six-membered aromatic ring with one nitrogen atom (pyridine), and a five-membered aromatic ring with one sulfur atom (thiophene). The ring sizes and heteroatoms identify option B.