Identify the stronger acid in each of the following pairs.

• A. a. Compound (ii) is more acidic
  b. Compound (i) is more acidic
• B. a. Compound (i) is more acidic
  b. Compound (ii) is more acidic
• C. a. Compound (ii) is more acidic
  b. Compound (ii) is more acidic
• D. a. Compound (i) is more acidic
  b. Compound (i) is more acidic

Answer: (C)