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Asked by: Test User 100129
Created at: 2025-05-18 04:45:50
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Let's analyze the structures and count the unshared (lone) pairs at each designated atom:
### First Structure (Benzene-like ring)
- **Atom a (Nitrogen)**: Nitrogen typically has 1 lone pair in organic compounds.
- **Atom b (Oxygen)**: Oxygen typically has 2 lone pairs.
- **Atom c (Carbon)**: Carbon in typical organic molecules (with four bonds) has 0 lone pairs.
### Second Structure (Carboxylic Acid)
- **Atom a (Oxygen double-bonded to carbon)**: Oxygen in a carbonyl group (C=O) has 2 lone pairs.
- **Atom b (Oxygen in -OH group)**: Oxygen in a hydroxyl group (-OH) has 2 lone pairs.
- **Atom c (Carbon)**: Carbon, when forming four bonds, has 0 lone pairs.
### Summary Table
| Structure | Atom | Number of Unshared Pairs |
|-----------|------|-------------------------|
| 1st | a | 1 |
| 1st | b | 2 |
| 1st | c | 0 |
| 2nd | a | 2 |
| 2nd | b | 2 |
| 2nd | c | 0 |
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**Answers:**
- The number of unshared pairs at atom a (first structure) is **1**.
- The number of unshared pairs at atom b (first structure) is **2**.
- The number of unshared pairs at atom c (first structure) is **0**.
- The number of unshared pairs at atom a (second structure) is **2**.
- The number of unshared pairs at atom b (second structure) is **2**.
- The number of unshared pairs at atom c (second structure) is **0**.
If you need further explanation for each atom, let me know!
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Unshared, or lone, electron pairs play an important role in determining the chemical and physical properties of organic
compounds. Thus, it is important to know which atoms carry unshared pairs. ®
Use the structural formulas below to determine the number of unshared pairs at each designated atom.
Be sure your answers are consistent with the formal charges on the formulas.
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