Which of the following substances produce flame on combustion ?
(i) Candle (ii) Camphor (iii) Magnesium
(iv) Petrol (iv) Paper

Options

A. (i) and (v) only
B. (i), (iv) and (v) only
C. (i), (ii) and (iii) only
D. All of these

Explanation

To determine which substances produce flame on combustion, we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Combustion**:
- Combustion is a chemical process where a substance reacts with oxygen to produce heat and light. This reaction typically results in the production of a flame if the substance is combustible.

2. **Analyzing Each Substance**:
- **(i) Candle**:
- A candle is made of wax, which is a hydrocarbon. When a candle burns, the wax vaporizes and reacts with oxygen, producing a flame.
- **Conclusion**: Yes, a candle produces flame on combustion.

- **(ii) Camphor**:
- Camphor is a volatile organic compound. It ignites easily and burns with a flame when exposed to heat and oxygen.
- **Conclusion**: Yes, camphor produces flame on combustion.

- **(iii) Magnesium**:
- Magnesium is a metal that burns with a bright white flame when ignited. It reacts vigorously with oxygen.
- **Conclusion**: Yes, magnesium produces flame on combustion.

- **(iv) Petrol**:
- Petrol is a liquid hydrocarbon fuel. It is highly flammable and produces a flame when it combusts in the presence of oxygen.
- **Conclusion**: Yes, petrol produces flame on combustion.

- **(v) Paper**:
- Paper is made from cellulose, which is also combustible. When paper is ignited, it burns and produces a flame.
- **Conclusion**: Yes, paper produces flame on combustion.

3. **Final Answer**:
- All the substances listed (Candle, Camphor, Magnesium, Petrol, and Paper) produce flame on combustion.