Question detail
Which of the following best explains the trend in flammability for alkanes from methane to octane?
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. Flammability increases because the molecules become more volatile.
- B. Flammability decreases because the molecules become less volatile.
- C. Flammability decreases because the molecules become more difficult to ignite.
- D. Flammability remains constant because all alkanes are similar.
Answer
The correct option is Flammability decreases because the molecules become more difficult to ignite..
Explanation
The correct option is Flammability decreases because the molecules become more difficult to ignite.. Flammability decreases because the molecules become more difficult to ignite. 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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