Halogen Reactivity

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Fluorine is most reactive halogen due to:

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1. **Anomalous Low Bond Energy**: The $F\u2013F$ bond dissociation enthalpy is surprisingly low (even lower than $Cl\u2013Cl$).
2. **Electronic Repulsion**: This is because Fluorine atoms are very small, and the lone pairs on the two $F$ atoms are very close together, leading to intense **inter-electronic repulsion** that weakens the bond.
3. **Oxidizing Power**: Fluorine has the highest reduction potential ($+2.87 \ V$) due to its small size and extremely high electronegativity, making it a violent oxidizing agent.
4. **Reaction Energy**: Reactions involving Fluorine are highly exothermic because the bonds Fluorine forms with other atoms are typically much stronger than the weak $F\u2013F$ bond.

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Halogen Reactivity

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