Glycerol as a triester present in:

Options

A. Petroleum
B. Kerosence
C. Vegetable oil & fat
D. Naphtha

Answer

To solve the question regarding where glycerol as a triester is present, we can follow these steps:

### Step 1: Understand the Structure of Glycerol
Glycerol, also known as glycerin, is a simple polyol compound. It has three hydroxyl (–OH) groups, which allows it to form esters with fatty acids.

**Hint:** Glycerol's structure is key to understanding its role in forming triesters.

### Step 2: Define Triesters
A triester is a type of ester that is formed when glycerol reacts with three fatty acid molecules. The resulting compounds are known as triglycerides.

**Hint:** Remember that triesters are formed from glycerol and fatty acids.

### Step 3: Identify the Types of Substances in the Options
The options provided are:
1. Petroleum
2. Kerosene
3. Vegetable oil and fat
4. Naphtha

We need to analyze which of these options typically contains triglycerides.

**Hint:** Consider the common sources of fats and oils in nature.

### Step 4: Analyze Each Option
- **Petroleum**: This is a complex mixture of hydrocarbons and does not contain glycerol or triglycerides.
- **Kerosene**: Kerosene is a type of fuel derived from petroleum and does not contain glycerol or triglycerides.
- **Vegetable oil and fat**: These are known to be composed of triglycerides, which are triesters of glycerol and fatty acids.
- **Naphtha**: Similar to kerosene, naphtha is also derived from petroleum and does not contain glycerol or triglycerides.

**Hint:** Focus on the biological sources of fats and oils.

### Step 5: Conclusion
From the analysis, the only option that contains glycerol as a triester is **vegetable oil and fat**. Therefore, the correct answer is option 3.

**Final Answer:** Glycerol as a triester is present in **vegetable oil and fat**.