In commercial gasolines the type of hydrocarbons which are more desirable , is

Options

A. branched hydrocarbons
B. stright - chain hydrocarbons
C. aromatic hydrocarbons such as toluene
D. linear unsaturated hydrocarbons

Answer

To determine the type of hydrocarbons that are more desirable in commercial gasolines, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Hydrocarbons**:
- Hydrocarbons can be categorized into different types: straight-chain hydrocarbons, branched hydrocarbons, aromatic hydrocarbons, linear hydrocarbons, and saturated hydrocarbons.

2. **Identify Desirable Properties**:
- In commercial gasolines, certain properties are desirable, such as a high octane number, low knocking tendency, and good volatility.

3. **Evaluate Each Type of Hydrocarbon**:
- **Straight-chain hydrocarbons**: Generally have lower octane numbers and can lead to knocking in engines.
- **Branched hydrocarbons**: These hydrocarbons tend to have higher octane numbers, which means they are less likely to cause knocking and have better combustion properties.
- **Aromatic hydrocarbons**: While they can have high octane numbers, they are not preferred in gasoline due to environmental concerns and potential health risks.
- **Linear hydrocarbons**: Similar to straight-chain hydrocarbons, they typically have lower octane numbers.
- **Saturated hydrocarbons**: These can be branched or straight; however, branched saturated hydrocarbons are more desirable due to their higher octane ratings.

4. **Conclusion**:
- Based on the evaluation, branched hydrocarbons are the most desirable type of hydrocarbons in commercial gasolines due to their higher octane number, which reduces knocking and enhances volatility.

### Final Answer:
The type of hydrocarbons that are more desirable in commercial gasolines is **Branched Hydrocarbons**.

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