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The order of reacivity of grou-1 element...

The order of reacivity of grou-1 elements is `Li lt Na lt K lt Rb lt Cs` whereas that of group-17 elements is `F gt Cl gt Br gt I`. Explain.

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In case of halogens, their reactivity increases with the increase in electron-gain enthalpy. Order of electron-gain enthalpy: `F lt Cl gt Br gt I`. As electron gain enthalpy decreases from Cl to I, the order of reactivity also follows this sequence. however, fluorine is the most reactive halogen as its bond dissociation energy is very low.
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