The chemical formula for marsh gas (methane) is:

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C_{2} H_{6}

{CH}_{4}

C_{3} H_{8}

C_{4} H_{10}

answer is B.

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Detailed Solution

Concept- A simple compound having a carbon-carbon chain is known as an alkane. Methane or marsh gas is an alkane.
Now, methane or marsh gas is a chemical compound with the chemical formula

C H_{4}

. It is the first member of the alkane series with one carbon atom and it is the main component of natural gas. In the structure of methane, the central carbon atom is

s p^{3}

hybridised and the four surrounding hydrogens are linked to the central carbon atom by sigma bonds.
Methane is also called hydrogen carbide.
Hence, the correct answer is 2.

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