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Which one of the following arrangements does not give the correct picture of the trends indicated against it?

1. F2 > Cl2 > Br2 > I2 : Oxidizing power
2. F2 > Cl2 > Br2 > I2 : Electron gain enthalpy
3. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
4. F2 > Cl2 > Br2 > I2 : Electronegativity

Correct answer: F2 > Cl2 > Br2 > I2 : Bond dissociation energy

Solution

The bond dissociation energy trend is not F2 > Cl2 > Br2 > I2 because F2 has abnormally low bond dissociation energy due to strong inter-electronic repulsion in its small size. The correct trend is Cl2 > Br2 > F2 > I2.

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