One mole ''trilinolein'' (X) on hydrogenation gave Y where 9 moles of hydrogen are found to be consumed. Now, number of ''pi'' bonds in X are

Options

A. 3/molecule
B. 3/each chain of fatty acid
C. 6/molecule
D. 9/each chain of fatty acid

Answer

To determine the number of pi bonds in one mole of trilinolein (X), we can follow these steps:

### Step 1: Understand the Structure of Trilinolein
Trilinolein is a triglyceride composed of three linoleic acid molecules. Each linoleic acid contains two double bonds (which correspond to pi bonds). Therefore, trilinolein has three chains of fatty acids.

### Step 2: Hydrogenation Process
During hydrogenation, hydrogen gas (H2) is added across the double bonds (pi bonds) in the fatty acids. Each double bond consumes one mole of hydrogen.

### Step 3: Analyze the Given Information
The problem states that one mole of trilinolein (X) consumes 9 moles of hydrogen during hydrogenation. This indicates that a total of 9 pi bonds are present in trilinolein.

### Step 4: Calculate the Number of Pi Bonds
Since trilinolein consists of three chains of fatty acids, we can divide the total number of pi bonds by the number of chains:
- Total pi bonds = 9
- Number of chains = 3

Thus, the number of pi bonds per chain = Total pi bonds / Number of chains = 9 / 3 = 3.

### Conclusion
Therefore, the number of pi bonds in each chain of fatty acid in trilinolein is 3.

### Final Answer
The correct option is: **3 per each chain of fatty acid.**

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