Chemistry 2009 JAMB Past Questions - Question 47: Which of the following hydrocarbons is mainly used as fuel?

Correct Answer

C

Explanation

Out of the options you provided, **Methane (CH₄)** is the hydrocarbon mainly used as fuel. Here's why:

* **Methylene (CH₂) and Ethylene (C₂H₄)** are not technically hydrocarbons themselves. Methylene is a diradical, meaning it has two unpaired electrons and cannot exist as a stable molecule on its own. Ethylene is an alkene, which has a double bond between carbon atoms, while hydrocarbons only have single bonds between carbon and hydrogen.
* **Ethyne (C₂H₂)**, also known as acetylene, is used as a fuel in some specific applications like welding, but it's not as widely used as methane due to its higher reactivity and tendency to form soot.
* **Methane**, on the other hand, is the main component of natural gas, which is a major fuel source used in homes for heating and cooking, as well as in power plants for electricity generation. It's also used in some vehicles like compressed natural gas (CNG) cars.

Therefore, the answer is **Methane**.