Determine the characteristic IR absorption band that can be used to distinguish between the following pair of compounds.

• A. I. An absorption band between 3000-2800 cm⁻¹.
  II. An absorption peak at 1680 cm⁻¹.
• B. I. An absorption band between 3650-3200 cm⁻¹.
  II. An absorption peak at 1680 cm⁻¹.
• C. I. An absorption band between 3650-3200 cm⁻¹.
  II. An absorption band between 3500-3300 cm⁻¹.
• D. I. An absorption band between 3000-2800 cm⁻¹.
  II. An absorption band between 3500-3300 cm⁻¹.

Answer: (C)