The triglycerides of which of the following unsaturated fatty acids are not present in oils and fats ?

Options

A. Oleic acid
B. Linoleic acid
C. Linolenic acid
D. Formic acid

Answer

To determine which unsaturated fatty acid's triglycerides are not present in oils and fats, we need to analyze the given options based on the number of carbon atoms they contain. The key point to remember is that triglycerides typically consist of fatty acids with long alkyl chains, specifically those that have more than 12 carbon atoms.

### Step-by-Step Solution:

1. **Identify the Given Fatty Acids:**
The options provided are:
- Oleic acid
- Linoleic acid
- Linolenic acid
- Formic acid

2. **Analyze Oleic Acid:**
- Molecular formula: C18H34O2
- Number of carbon atoms: 18
- Since 18 > 12, oleic acid is present in oils and fats.

3. **Analyze Linoleic Acid:**
- Molecular formula: C18H32O2
- Number of carbon atoms: 18
- Since 18 > 12, linoleic acid is also present in oils and fats.

4. **Analyze Linolenic Acid:**
- Molecular formula: C18H30O2
- Number of carbon atoms: 18
- Since 18 > 12, linolenic acid is also present in oils and fats.

5. **Analyze Formic Acid:**
- Molecular formula: CH2O2
- Number of carbon atoms: 1
- Since 1 < 12, formic acid does not meet the requirement and is not present in oils and fats.

6. **Conclusion:**
The triglycerides of **formic acid** are not present in oils and fats because it has only one carbon atom, which is less than the required minimum of 12 carbon atoms.

### Final Answer:
**Formic acid**