Select the reaction when the supply of air is very limited;
Correct answer: D. 2CH4 + 2O2 → 2CO + 4H2O + heat
- A. CH4 + 2O2 → CO2 + 2H2O + heat
- B. 2CH4 + 3O2 → 2CO2 + 4H2O + heat
- C. CH3 - CH3 + 7O2 → CO2 + 6H2O + heat
- D. 2CH4 + 2O2 → 2CO + 4H2O + heat
Explanation
When oxygen supply is limited, combustion is incomplete, leading to the formation of carbon monoxide (CO) and water (H2O). Option D correctly reflects this situation, as methane reacts with a limited amount of oxygen to produce CO and H2O. The other options (A, B, and C) depict complete combustion scenarios, which occur when there is an ample oxygen supply, resulting in carbon dioxide (CO2) and water.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Alkanes
Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.
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