Following are the statements with reference to 'lipids'. (a) Lipids having only single bonds are called unsaturated fatty acids. (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. (e) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below

Solution & Explanation

Answer: (A) (b) and (c) only. Solution: (a) is false — fatty acids with only single bonds are saturated, not unsaturated. (b) is true — lecithin is a phospholipid found in cell membranes. (c) is true — glycerol is trihydroxy propane. (d) is false — palmitic acid has 16 carbons (including carboxyl carbon), not 20. (e) is false — arachidonic acid has 20 carbons, not 16. Only (b) and (c) are correct, so option A. NCERT Reference: Ch 9, p.106, line ~17 — "palmitic acid has 16 carbons including carboxyl carbon. Arachidonic acid has 20 carbon atoms including the carboxyl carbon... Another simple lipid is glycerol which is trihydroxy propane." (Lecithin as phospholipid: p.106, line ~28.)