The cyclic voltammogram of the antibiotic chloramphenicol (abbreviated RNO₂) is shown here. The scan was started at 0 V, and potential was swept toward negative voltage. The first cathodic wave, A, is from the reaction . Explain what happens at peaks B and C by using the reaction . Why was peak C not seen in the initial scan?

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RNO2 + 4e + 4H+ → RNHOH + H2O