Chemistry Hydrocarbons PMC 2021
PMDC Verified Question 18 of 65
Which of the following is marsh gas
A
Ethane
B
Propane
C
Butane
D
Methane
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Methane
Concept:

Marsh gas is a historical and common name for the gas primarily produced by the anaerobic bacterial decomposition of organic matter in wetlands and swamps.

Solution:

  • The simplest alkane, Methane (\( \text{CH}_4 \)), is the chief constituent of the biogas produced in marshy areas.


  • Due to its origin, it was historically referred to as "marsh gas".


Why other options are incorrect:

  • Ethane, propane, and butane are heavier alkanes derived primarily from petroleum and natural gas reserves, not the primary product of surface-level swamp decomposition.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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