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Which one of the following orders is not in accordance with the property stated against it?

1. HI > HBr > HCl > HF : Acidic property in water
2. F2 > Cl2 > Br2 > I2 : Electronegativity
3. F2 > Cl2 > Br2 > I2 : Bond dissociation energy
4. F2 > Cl2 > Br2 > I2 : Oxidizing power

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

Solution

The bond dissociation energy does not follow the order F2 > Cl2 > Br2 > I2 because F2 has abnormally low bond dissociation energy due to strong inter-electronic repulsion in its small size. Cl2 has the highest bond dissociation energy.

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