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Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. I2 > Br2 > Cl2 > F2
2. Cl2 > Br2 > F2 > I2
3. Br2 > I2 > F2 > Cl2
4. F2 > Cl2 > Br2 > I2

Correct answer: Cl2 > Br2 > F2 > I2

Solution

The bond dissociation enthalpy decreases down the group due to increasing atomic size and decreasing bond strength, except for F2, which is lower than Cl2 due to strong inter-electronic repulsion in its small size.

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