# Solution containing Iodine

The question is:-

Iodine dissolves in a variety of solvents forming solutions that are purple, brown or any intermediate shade. This property is due to:-

1. Hydrolysis of iodine
3. Charge transfer between $\ce{I-I^-}$ and the solvent
4. Charge tranfer between $\ce{I-I+}$ and the solvent

I am completely aware of which concept does option 3 and 4 allude to. I know the formation of $\ce{I_3-}$ when iodine is dissolved in solution of iodides. This fact, according to me, is what option 2 refers. But the answer given is 3? Can someone provide an explanation as to what concept is involved here and how can we predict the answer. I read about charge transfer complexes, but the wikipedia page was too complicated for me to understand, and also the application of that to the question under consideration was not given.