For each of the molecules below, determine if they are aromatic, nonaromatic, or antiaromatic. H;C

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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14.

**Title: Analyzing Aromaticity in Molecular Structures**

**Instruction:**
For each of the molecules below, determine if they are aromatic, nonaromatic, or antiaromatic.

**Molecular Structures:**

1. **First Structure:**
   - A bicyclic compound resembling a boat shape.
   - Contains two parallel lines at the top, indicating double bonds.

2. **Second Structure:**
   - A heterocyclic compound with a nitrogen atom in one of the rings.
   - Features two fused rings: one six-membered and one five-membered.
   - The six-membered ring shows alternating single and double bonds, characteristic of aromatic systems.

3. **Third Structure:**
   - A five-membered ring with a positive charge.
   - Contains a methyl group (CH₃) attached to one of the carbon atoms.
   - Exhibits resonance due to the positive charge, potentially affecting its aromaticity.

**Objective:**
Evaluate the aromaticity criteria for each structure, considering Huckel's rule, planarity, and electronic configuration, to categorize them appropriately.
Transcribed Image Text:**Title: Analyzing Aromaticity in Molecular Structures** **Instruction:** For each of the molecules below, determine if they are aromatic, nonaromatic, or antiaromatic. **Molecular Structures:** 1. **First Structure:** - A bicyclic compound resembling a boat shape. - Contains two parallel lines at the top, indicating double bonds. 2. **Second Structure:** - A heterocyclic compound with a nitrogen atom in one of the rings. - Features two fused rings: one six-membered and one five-membered. - The six-membered ring shows alternating single and double bonds, characteristic of aromatic systems. 3. **Third Structure:** - A five-membered ring with a positive charge. - Contains a methyl group (CH₃) attached to one of the carbon atoms. - Exhibits resonance due to the positive charge, potentially affecting its aromaticity. **Objective:** Evaluate the aromaticity criteria for each structure, considering Huckel's rule, planarity, and electronic configuration, to categorize them appropriately.
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