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You should show your attempts at solving the question to receive help. This is a forum policy.There is no real physical property that can be measured and that reflects oxidation state of atom. It is nothing unusual to get some strange values.
One Iodine is -1 the other two 0. Same rule like in carbonhydrids. C-C is also 0.For mathematics in redox reaction how much is the value then for Iodine?
Lets have CH4 then Carbon is -4 and the hydrogen each +1.CH3-CH3 by law a C-C bond is 0, so each Carbon is -3CH3-CH2-CH3 -3,-2,-3, etc.orCH3-COOH -3, +3 and more examples.
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