Q. 115.0( 1 Vote )
Which of the following elements does not show disproportionation tendency?
The compound under consideration contains fluorine, but according to rule for oxidation numbers, fluorine cannot attain any other oxidation number than -1, so disproportionation reaction are not possible with fluorine compounds.
Another reason is the electronic configuration of fluorine,
EC = 2s2 2p5
The possibility of electrons being removed from fluorine can be considered by supplying external energy, but as removing 2 or 5 electrons would require large amount of external energy which is not generally present during a chemical reaction which only proceeds using the enthalpy of the reaction. Thus instead of giving any of its electrons, F can just accept 1 e- and complete its octate and attain stability. This process is spontaneous as shown by the high reduction potential of 2.87 V.
E° = 2.87 V
Thus the possibility of F giving electron is diminished hence it cannot undergo disproportionation reaction.
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