Question

What is the number of \(>\mathrm{C}=\mathrm{C}<\) bonds present in a linolenic acid molecule?

• A. Zero
• B. One
• C. Two
• D. Three

Hint:

Linolenic acid is an 18-carbon polyunsaturated fatty acid; count its double bonds.

Answer 1

The Correct Option is D

Step 1: Recall the structure
Linolenic acid is 9,12,15-octadecatrienoic acid.

Step 2: Read the name
The locants 9, 12 and 15 mark the positions of the double bonds, and the ending 'trienoic' also means three.

Step 3: Conclusion
So the molecule has three C=C bonds.

Final Answer:
The name of the acid shows three double bonds. \[ \boxed{\text{(D) }\text{Three}} \]