Chemistry Hydrocarbons SET 2019
PMDC Verified Question 24 of 65
Which of the options show all possible products of combustion of Butene?
A
\( \text{CO} + \text{CO}_2 + \text{H}_2\text{O} \)
B
\( \text{CO}_2 + \text{H}_2\text{O} \)
C
\( \text{C} + \text{CO} + \text{CO}_2 \)
D
\( \text{C} + \text{CO} + \text{CO}_2 + \text{H}_2\text{O} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( \text{C} + \text{CO} + \text{CO}_2 + \text{H}_2\text{O} \)
Concept:

Combustion of hydrocarbons yields different products depending strictly on the availability of oxygen.

Solution:

  • Complete Combustion: With abundant oxygen, hydrocarbons oxidize entirely to Carbon Dioxide (\( \text{CO}_2 \)) and Water (\( \text{H}_2\text{O} \)).


  • Incomplete Combustion: When oxygen is limited, the carbon does not fully oxidize. This produces toxic Carbon Monoxide (\( \text{CO} \)), unburned Carbon soot (\( \text{C} \)), and Water (\( \text{H}_2\text{O} \)).


  • Since the question asks for all possible products of combustion (encompassing both complete and incomplete scenarios), the aggregate list must include all these species: Carbon (C), Carbon Monoxide (CO), Carbon Dioxide (\( \text{CO}_2 \)), and Water (\( \text{H}_2\text{O} \)).


Why other options are incorrect:

  • Other options are partial lists that omit either the solid carbon (soot) from severe incomplete combustion, or the water vapor which is invariably formed in all combustion of hydrocarbons.

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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