Which of the following heterocyclic compounds successfully achieve an aromatic -electron sextet by u — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

Furan (oxygen), thiophene (sulfur), and pyrrole (nitrogen) all donate one lone pair from an unhybridized p-orbital into the ring to complete the 6 $\pi$ -electron aromatic sextet. Pyridine achieves its sextet purely through its double bonds; its lone pair remains orthogonal to the $\pi$ -system.