Among halogens, the correct order of energy released in electron gain (electron gain enthalpy) is:

F > C l > B r > I

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F < C l < B r < I

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F < C l > B r > I

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F < C l < B r > I

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Solution

The correct option is C $F < C l > B r > I$
In a group, electron gain enthalpy decreases while moving down. But here $C l$ has a higher electron gain enthalpy than $F$ . It is because in $F$ , the electron density is more and size is very small. So, addition of electron to $F$ results in higher repulsion than addition of electon to $C l$ . Hence addition of electron to $C l$ release more energy compared to $F$ .

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