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Question

The chemical formula of marsh gas (methane) is


A

C2H6

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B

CH4

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C

C3H8

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D

C4H10

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Solution

The correct option is B

CH4


The explanation for the Correct answer

(B) CH4

  1. Methane is the main constituent of natural gas and is also known as marsh gas or methyl hydride.
  2. Methane is the simplest alkane and has a carbon atom and four hydrogen atoms and the chemical formula isCH4.
  3. Structural formula: File:Methane.Structural formula.V1.svg - Wikimedia Commons
  4. Hence, option B is correct.

The explanation for the incorrect answer

(A) C2H6

  1. It is known as ethane through homologous series from where the number of carbon atoms is two and six hydrogen atoms, so its name is ethane.
  2. Structural formula:Ethane Molecular Formula, Structure & Uses | What is Ethane? - Video &  Lesson Transcript | Study.com
  3. Hence, option (A) is incorrect.

(C) C3H8

  1. It is called propane as it has three carbon atoms and eight hydrogen atoms.
  2. Structural formula: What is the propane gas chemical formula?
  3. Hence, option (C) is incorrect.

(D) C4H10

  1. It is called butane as it has four carbon atoms and ten hydrogen atoms.
  2. Structural formula:Butane - Wikipedia
  3. Hence option (D) is incorrect.

Therefore, Marsh gas methane isCH4, hence option (B) is correct.


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