8. For the following reaction, which of the following change(s) in the IR spectrum is consistent with conversion of the reactant to the product?

A) absorption at 2250 cm' should disappear B) absorption at 3200-3400 cm and 1720cm' should appear C) absorption at 2250 cm' should disappear, new absorptions at 2600-2800 cm-l and 1720cm' should аppear. D) absorption at 2250 cm' should disappear, a new absorption around 3400 cm' should аppear. E) none of these