Question

Which of the following gases is called ‘marsh gas’?
A. ${H_2}$
B. $C{H_4}$
C. ${C_2}{H_4}$
D. ${C_2}{H_2}$

Answer 1

Marsh gas gets its name because of the fact that it is released near marshlands and creeks. The decomposition of the various organic materials below the surface of the water results in the formation of marsh gas.

Complete Step-by-Step Answer:
Before we move forward with the solution of the given question, let us understand some important basic concepts.
Marsh gases are usually a natural gaseous product produced due to bacterial decomposition of organic materials in marshes.
This gas has no smell or colour. Hence it is very difficult to understand the existence of this gas without any instruments. This gas is also lighter than air. Marsh gas is soluble in water but the solubility of marsh gases increases in organic solvents like ethyl alcohol and ethyl ether. Marsh gas is none other than methane. It is an organic gas that is released by the bodies of several other living and non – living organisms. The molecular formula of methane is $C{H_4}$ .

Hence, Option B is the correct option

Note: For a long time, people used to associate the fires caused in the marshlands on some unexplainable activity. But if we look at this issue from a chemistry point of view, then we can say that these fires are caused by marsh gas. When some dry branches rub against each other due to wind, they create a spark in the surrounding which is filled by the highly flammable marsh gas.