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Aromatic Heterocycles
18. Aromaticity / Aromaticity of Heterocycles / Problema 2
Problema 2

Classify each of the following compounds as nonaromatic, antiaromatic, or aromatic. Provide a brief explanation for your answer.
Three aromatic heterocycles for classification: (i) with N and O, (ii) with N and S, (iii) with O.