What is the aromaticity of thiophene, and which electrons complete its aromatic sextet?
QUESTION
Which positions on benzene are called ortho, meta, and para relative to a substituent?
QUESTION
What is the aromaticity of furan, and which electrons complete its aromatic sextet?
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ANSWER
Aromatic; one O lone pair contributes to make 6 electrons. Furan's aromaticity in its five-membered ring relies on oxygen's lone pair contributing to the π system for Hückel compliance.