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Which of the following heterocycles is aromatic according to Huckel's rules? OOOO I-Z: N. I-Z: I I and II I, III and IV II, III and IV IV only II III I-Z: IV

Which of the following heterocycles is aromatic according to Huckel's rules? OOOO I-Z: N. I-Z: I I and II I, III and IV II, III and IV IV only II III I-Z: IV

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Aromatic Heterocycles and Huckel’s Rule **Which of the following heterocycles is aromatic according to Huckel's rules?** 1. **Structure I**: - A six-membered ring with two nitrogen atoms and double bonds. Each nitrogen has a lone pair of electrons. 2. **Structure II**: - A five-membered ring containing a sulfur atom. The ring has two double bonds, and the sulfur atom has two lone pairs of electrons. 3. **Structure III**: - A six-membered ring with one nitrogen atom and double bonds. The nitrogen atom has a lone pair of electrons. 4. **Structure IV**: - A five-membered ring with a nitrogen atom and two double bonds. The nitrogen has one hydrogen and two lone pairs of electrons. ### Options: - ○ I and II - ○ I, III and IV - ○ II, III and IV - ○ IV only **Explanation**: Aromatic compounds follow Huckel's rule, which states that a planar, cyclic molecule is aromatic if it has \(4n + 2\) \(\pi\) electrons. Each structure needs to be evaluated for planarity, cyclic nature, and the number of \(\pi\) electrons to determine aromaticity.
Transcribed Image Text:### Aromatic Heterocycles and Huckel’s Rule **Which of the following heterocycles is aromatic according to Huckel's rules?** 1. **Structure I**: - A six-membered ring with two nitrogen atoms and double bonds. Each nitrogen has a lone pair of electrons. 2. **Structure II**: - A five-membered ring containing a sulfur atom. The ring has two double bonds, and the sulfur atom has two lone pairs of electrons. 3. **Structure III**: - A six-membered ring with one nitrogen atom and double bonds. The nitrogen atom has a lone pair of electrons. 4. **Structure IV**: - A five-membered ring with a nitrogen atom and two double bonds. The nitrogen has one hydrogen and two lone pairs of electrons. ### Options: - ○ I and II - ○ I, III and IV - ○ II, III and IV - ○ IV only **Explanation**: Aromatic compounds follow Huckel's rule, which states that a planar, cyclic molecule is aromatic if it has \(4n + 2\) \(\pi\) electrons. Each structure needs to be evaluated for planarity, cyclic nature, and the number of \(\pi\) electrons to determine aromaticity.
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