Question detail
Which of the following statements is true regarding the flammability of alkanes used as fuels?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Carbon compounds as fuels and feedstock
Question
- A. All alkanes are equally flammable and can be used interchangeably.
- B. Smaller alkanes are more flammable and are preferred for high-energy fuels.
- C. Larger alkanes are more flammable and are preferred for high-energy fuels.
- D. Flammability is unrelated to alkane size and depends only on temperature.
Answer
The correct option is Smaller alkanes are more flammable and are preferred for high-energy fuels..
Explanation
The correct option is Smaller alkanes are more flammable and are preferred for high-energy fuels.. Smaller alkanes are more flammable and are preferred for high-energy fuels. is correct because it directly supports the approved learning objective to recall how flammability changes with increasing molecular size. This belongs to Properties and combustion of hydrocarbons within Carbon compounds as fuels and feedstock, so the answer must use the correct organic chemistry context. The other options are incorrect when they confuse the organic family, formula type, reaction condition, product, or property being tested. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Flammability Misconception
Students often think that larger hydrocarbons are more flammable than smaller ones.
Remember that as molecular size increases, flammability generally decreases due to higher boiling points and increased viscosity.
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