Number of components of fractional distillation of petroleum is _________ .
Diesel, coke,paraffin wax, kerosene, coal gas, coal tar,petroleum gas, gasoline, CNG

Explanation

To determine the number of components obtained from the fractional distillation of petroleum, we will identify each component mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Components**: The question lists several substances. We need to identify which of these are products of fractional distillation of petroleum.

2. **List of Components**:
- Diesel
- Paraffin wax
- Kerosene
- Petroleum gas
- Gasoline
- CNG (Compressed Natural Gas)
- Coal gas
- Coal tar
- Coke

3. **Categorization**:
- **Products of Fractional Distillation**:
- Diesel
- Paraffin wax
- Kerosene
- Petroleum gas
- Gasoline
- **Not Products of Fractional Distillation**:
- CNG (typically derived from natural gas, not petroleum)
- Coal gas (derived from coal)
- Coal tar (a byproduct of coal processing)
- Coke (produced from coal)

4. **Count the Components**: Now, we will count only the components that are products of fractional distillation of petroleum:
- Diesel
- Paraffin wax
- Kerosene
- Petroleum gas
- Gasoline

This gives us a total of **5 components**.

### Final Answer:
The number of components of fractional distillation of petroleum is **5**.

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