Question

Which of the following is NOT a saponifiable lipid?

• A. Triglycerides
• B. Waxes
• C. Cholesterol
• D. Phospholipids

Hint:

Saponifiable lipids contain ester bonds; cholesterol is a non-saponifiable lipid.

Answer 1

The Correct Option is C

Concept:
Lipids may be classified as saponifiable and non-saponifiable lipids.

Step 1: Meaning of saponifiable lipids.
Saponifiable lipids contain ester bonds. On hydrolysis with alkali, they form soaps.

Step 2: Examples of saponifiable lipids.
Triglycerides, waxes, and phospholipids contain ester linkages. Hence, they are saponifiable lipids.

Step 3: Why cholesterol is not saponifiable.
Cholesterol is a sterol. It does not contain ester linkage in its basic free form, so it is not saponifiable.

Step 4: Final answer.
Therefore, cholesterol is not a saponifiable lipid. \[ \boxed{\text{Cholesterol}} \]