Which one of the following arrangements not truly represent the property indicated against it?

Options

A. `Br_(2) lt Cl_(2) lt F_(2)` , electronegativity
B. `Br_(2) lt F_(2) lt Cl_(2)`, electron affinity
C. `Br_(2) lt Cl_(2) lt F_(2)`, bond energy
D. `Br_(2) lt Cl_(2) lt F_(2)`, oxidising power

Answer

To solve the question regarding which arrangement does not truly represent the indicated property, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Electronegativity**:
- Electronegativity is the tendency of an atom to attract shared electrons in a chemical bond.
- In the case of halogens (F, Cl, Br), the electronegativity decreases as we move down the group from fluorine to bromine.
- The correct order of electronegativity is: **F > Cl > Br**.
- **Conclusion**: The arrangement for electronegativity is correct.

2. **Understanding Electron Affinity**:
- Electron affinity refers to the energy change when an atom gains an electron.
- Chlorine has a higher electron affinity than fluorine due to the smaller size of fluorine leading to electron-electron repulsion.
- The correct order of electron affinity is: **Cl > F > Br**.
- **Conclusion**: The arrangement for electron affinity is also correct.

3. **Understanding Bond Energy**:
- Bond energy is the energy required to break a bond between two atoms.
- The bond energy order for the halogens is influenced by the size and electron repulsion.
- The correct order of bond energy is: **Cl2 > Br2 > F2**.
- In this case, F2 has the lowest bond energy due to high electron repulsion in its small size.
- **Conclusion**: The arrangement for bond energy is incorrect as stated in the question.

4. **Understanding Oxidizing Power**:
- Oxidizing power is the ability of a substance to gain electrons.
- The correct order of oxidizing power for halogens is: **F2 > Cl2 > Br2**.
- **Conclusion**: The arrangement for oxidizing power is correct.

### Final Answer:
The arrangement that does not truly represent the property indicated is the bond energy order: **F2 < Cl2 < Br2** (which should be **Cl2 > Br2 > F2**).