Incorrect order of properties given in parenthesis are

Options

A. `Cl gt S gt F gt O" (Electron affinity)"`
B. `O gt F gt B gt C (IE_(2))`
C. `N gt O gt P gt S (IE_(1))`
D. `O gt C gt B gt N "(Electron affintiy)"`

Answer

To solve the question regarding the incorrect order of properties (electron affinity and ionization energy), we will analyze the trends for both properties step by step.

### Step 1: Understanding Electron Affinity
- **Definition**: Electron affinity is the energy change that occurs when an electron is added to a neutral atom.
- **Trend**:
- **Across a Period**: Electron affinity generally increases from left to right due to increasing nuclear charge.
- **Down a Group**: Electron affinity generally decreases due to increasing atomic size and shielding effect.

### Step 2: Analyzing Electron Affinity for Given Elements
- **Elements**: Oxygen (O), Sulfur (S), Fluorine (F), Chlorine (Cl).
- **Expected Trend**:
- F > Cl (Fluorine should have a higher electron affinity than Chlorine)
- O > S (Oxygen should have a higher electron affinity than Sulfur)
- **Actual Trend**:
- Due to inter-electronic repulsions in small atoms, the correct order is Cl > F and S > O.

### Step 3: Understanding Ionization Energy
- **Definition**: Ionization energy is the energy required to remove an electron from a neutral atom.
- **Trend**:
- **Across a Period**: Ionization energy generally increases from left to right due to increasing nuclear charge.
- **Down a Group**: Ionization energy generally decreases due to increasing atomic size.

### Step 4: Analyzing Ionization Energy for Given Elements
- **Elements**: Oxygen (O), Nitrogen (N), Fluorine (F), and others.
- **Expected Trend**:
- O > N (Oxygen should have a higher ionization energy than Nitrogen due to its electronic configuration).
- **Actual Trend**:
- N has a higher ionization energy than O because Nitrogen has a half-filled p-orbital configuration (2s² 2p³), making it more stable and harder to remove an electron.

### Step 5: Conclusion
- **Incorrect Order**: The question asks for the incorrect order of properties. Based on our analysis:
- For electron affinity, the incorrect order is Cl > F instead of F > Cl.
- For ionization energy, the incorrect order is O > N instead of N > O.

### Final Answer
The incorrect order of properties given in parenthesis is:
1. Electron Affinity: Cl > F (should be F > Cl)
2. Ionization Energy: O > N (should be N > O)