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The oxidising power of halogen follows the order F2 > Cl2 > Br2 > I2. Which of the following is correct?

1. The correct order of electron gain enthalpy of halogens is Cl2 > F2 > Br2 > I2. The low value of F2 than Cl2 is due to its small size.
2. The correct order of bond dissociation energies of halogens is Cl2 > Br2 > F2 > I2.
3. The correct order of electronegativity values of halogens is F2 > Cl2 > Br2 > I2.
4. Br- and I- ion act as reducing agents and their reducing nature is in increasing order Cl- > Br- > I-.

Correct answer: The correct order of electron gain enthalpy of halogens is Cl2 > F2 > Br2 > I2. The low value of F2 than Cl2 is due to its small size.

Solution

The oxidizing power of halogens is influenced by their electron gain enthalpy, which follows the order Cl2 > F2 > Br2 > I2. Fluorine's lower electron gain enthalpy compared to chlorine is due to its small size and high electron-electron repulsion in its compact 2p orbital.

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