Question detail
Which of the following statements is true regarding the viscosity of hydrocarbons?
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. Smaller hydrocarbons are more viscous than larger ones
- B. Larger hydrocarbons are less viscous than smaller ones
- C. Larger hydrocarbons are more viscous than smaller ones
- D. Viscosity is not affected by molecular size
Answer
The correct option is Larger hydrocarbons are more viscous than smaller ones.
Explanation
The correct option is Larger hydrocarbons are more viscous than smaller ones. Larger hydrocarbons are more viscous than smaller ones is correct because it directly supports the approved learning objective to recall how viscosity 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
Viscosity Misconception
Students think viscosity decreases as hydrocarbon chain length increases, assuming longer chains flow more easily.
Explain that longer hydrocarbon molecules have more surface area and stronger London dispersion forces, so viscosity increases with chain length.
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