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Question

Why does fluorine not show a disproportionation reaction?

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Solution

Disproportionation reactions: In these type of reactions same species gets reduced and oxidised simultaneously.
For a species to participate in a disproportionation reaction, it should be able to show variables oxidation state.

Fluorine is the most electronegative atom and has extremely small size.

Electronic configuration of fluorine:

1s22s22p5

Thus, fluorine readily accepts one electron to achive stable insert gas configuration. Since it is gaining one electron, it exists as F ion with -1 oxidation number.

Due to its highest electronegativity, it cannot lose electron, that's why fluorine does not show variable state.

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