Question

Following are the statements with reference to ??ipids. (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.

• (a) and (b) only
• (c) and (d) only
• (b) and (c) only
• (b) and (e) only

Answer 1

The Correct Option is C

The given question asks us to identify the correct statements regarding lipids. Let's evaluate each statement:

1. Statement (a): "Lipids having only single bonds are called unsaturated fatty acids."
   • This statement is incorrect. Lipids with only single bonds are called saturated fatty acids. Unsaturated fatty acids contain one or more double bonds between carbon atoms. 
2. Statement (b): "Lecithin is a phospholipid."
   • This statement is correct. Lecithin is indeed a phospholipid, which is a major component of cell membranes and is involved in lipid metabolism.
3. Statement (c): "Trihydroxy propane is glycerol."
   • This statement is correct. Glycerol, a simple polyol compound, is also known as trihydroxy propane as it contains three hydroxyl (-OH) groups.
4. Statement (d): "Palmitic acid has 20 carbon atoms including carboxyl carbon."
   • This statement is incorrect. Palmitic acid has 16 carbon atoms, not 20, including the carboxyl carbon.
5. Statement (e): "Arachidonic acid has 16 carbon atoms."
   • This statement is incorrect. Arachidonic acid actually has 20 carbon atoms.

Based on the evaluation above, the correct statements are (b) and (c). Thus, the correct answer is:

(b) and (c) only