Which of the following pairs correctly matches fatty acid category with its double-bond status?

• A. Saturated — contains double bonds
• B. Monounsaturated — no double bonds
• C. Polyunsaturated — one double bond
• D. Unsaturated — contains double bonds

Answer: (D)

Double-bond status defines fatty acid saturation: saturated fatty acids have only single bonds between carbon atoms, so they contain no C=C double bonds. Monounsaturated fats have exactly one double bond, while polyunsaturated fats have two or more. Unsaturated fats are those with at least one double bond, which creates kinks in the chain and prevents tight packing, making them typically liquids at room temperature. Since the statement that unsaturated fats contain double bonds is true, that pairing is the correct one.