Question:
Justify giving reactions that among halogens, fluorine is the best oxidant and among hydrohalic compounds, hydroiodic acid is the best reductant.
Answer:
F2 oxidises CI- to C12, Br- to Br2, I- to 12. F2 + 2C1- —> 2F- + C12 F2 + 2Br- —>2F-Br2 F2 + 21- —> 2F- +12
Cl2 oxidises Br- to Br2, I- to 12. C12 + 2Br- —> 2C1- + Br2 C12 + 21- —> 2C1- +12
Br2 oxidises I- to 12. Br2 + 21- —> 2Br- +12
But Br2 and Cl2 cannot oxidize F- to F2. Therefore F2 is the best oxidizing agent amongst the halogens.
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