Proteins Containing a Certain Functional Group (Identified as RSH) Can $\rightarrow$

question 81

Multiple Choice

Proteins containing a certain functional group (identified as RSH) can be titrated with triiodide ion to produce another functional group (identified as RSSR) . The reaction equation is given below. What is oxidized and what is reduced in this reaction?
2RSH + I₃^- $\rightarrow$ 3I^- + RSSR + 2H⁺

• A) RSH is oxidized, I₃^- is reduced.
• B) RSH is reduced, I is oxidized.
• C) Both RSH and I are oxidized.
• D) Both RSH and I are reduced.
• E) This reaction is not oxidation-reduction.

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