Assertion : Candle burns with a flame whereas coal does not.
Reason : Coal is converted to vapours on combustion.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that "Candle burns with a flame whereas coal does not." This means that when a candle is lit, it produces a visible flame, while coal, when burned, does not produce a flame.

**Hint**: Think about the physical appearance of burning candle wax versus burning coal.

2. **Analyzing the Reason**: The reason given is "Coal is converted to vapours on combustion." This implies that during the burning process, coal transforms into vapor, which would suggest it should produce a flame.

**Hint**: Consider what happens to different materials when they are heated or burned.

3. **Evaluating the Truth of the Assertion**: The assertion is true. A candle, which is made of wax, burns and produces a flame because the wax vaporizes and ignites. Coal, on the other hand, does not produce a flame in the same way.

**Hint**: Recall the properties of solid fuels and how they burn compared to liquid fuels.

4. **Evaluating the Truth of the Reason**: The reason is false. Coal does not vaporize in the same way that a liquid fuel does when heated. Instead, it burns as a solid and produces heat and gases, but not a flame like a candle.

**Hint**: Think about the combustion process of solids versus liquids and gases.

5. **Conclusion**: Since the assertion is true and the reason is false, we can conclude that the correct option is that the assertion is true and the reason is false.

**Hint**: Look for the option that matches this conclusion in your choices.

### Final Answer
The correct answer is that the assertion is true and the reason is false.