The cyclic voltammogram for methyl benzoate was recorded in dimethylformamide (DMF) using a platinum working electrode (lower curve). The product appears to be a singly-charged aryl radical. The solution was then exposed to \(\mathrm{CO}_{2}\) and a second voltammogram was scanned (upper curve).

Suggest a chemical explanation for the difference in behavior (in broad terms). Describe an experiment that would show support or refute your hypothesis.

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-1.5 Eapplied versus SCE -2.5 CO present +e