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

Options

A. Linear unsaturated hydrocarbon
B. Toulene
C. Branced hydrocarbon
D. Straight-chain hydrocarbon

Answer

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

### Step 1: Understand the Types of Hydrocarbons
Hydrocarbons can be classified into different categories, such as:
- **Alkanes** (saturated hydrocarbons)
- **Alkenes** (unsaturated hydrocarbons with double bonds)
- **Alkynes** (unsaturated hydrocarbons with triple bonds)
- **Aromatic hydrocarbons** (like toluene)

### Step 2: Identify Desirable Properties in Gasoline
In commercial gasoline, certain properties are desirable:
- High **octane number**: This indicates better fuel performance and efficiency.
- Low **knocking**: Knocking is the sound produced by the premature combustion of the air-fuel mixture in the engine, which can lead to engine damage.

### Step 3: Analyze the Impact of Hydrocarbon Structure
- **Branched hydrocarbons** tend to have a higher octane number compared to straight-chain hydrocarbons. This is because the branching reduces the likelihood of knocking.
- **Straight-chain hydrocarbons** generally have lower octane numbers and are more prone to knocking.

### Step 4: Conclude the Most Desirable Hydrocarbon Type
Given that branched hydrocarbons have:
- Higher octane numbers
- Lower knocking tendencies
- Greater volatility (which aids in combustion)

We can conclude that **branched hydrocarbons** are more desirable in commercial gasolines.

### Final Answer
The type of hydrocarbons which are more desirable in commercial gasolines is **branched hydrocarbons**.

---