Explain Anamalous Nature of Fluorine - QS Study
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Anamalous Nature of Fluorine

  1. Fluorine is the most reactive element among halogen. This is due to the minimum value of F–F bond dissociation energy.
  2. Fluorine decomposes cold dilute alkalies liberating OF2 and with conc. alkali, O2 is liberated. Under similar conditions, the other halogens will give rise to the hypohalites and halates respectively.
  3. It has the greatest affinity for hydrogen, forming HF which is associated due to the hydrogen bonding. Hydrofluoric acid is a weak acid whereas the other hydrohalic acids are strong acids.

…… H– F…… H– F….. H– F.

  1. It differs markedly from the other halogens in that it can form two types of salts with metals. NaF and NaHF2.
  2. The salts of HF differ from the corresponding salts of other hydracids. AgF is soluble in water while the other AgX are insoluble.
  3. Being strongly electronegative it can have only a negative oxidation state while the other halogens can have negative as well as positive oxidation state.
  4. HF attacks glass while others do not.
  5. Fluorine, because of the absence of d-orbitals in its valence shell does not form any polyhalides. Thus we have Ι3, Br3, Cl3ions but no F3ion.