Iron forms iron halides salts by reacting the metal directly with halogen. `FeI_(3)` does not exist. `FeF_(3)` is white soled inspite of five unpaired electrons with `d^(5)` configuration . `FeCl_(3)` is soluble in water and is used as a mordant in dyeing industry.
Q.`FeI_(3)` does not exist because:

Options

A. of large size
B. `Fe^(3+)` oxidise `I^(-)` to `I_(2)`
C. of low lattice energy
D. iodine is not highly electronegative enough to oxidise Fe to `Fe^(3+)`

Answer

B