Question detail
What is the main reason for cracking 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. To increase the size of the molecules
- B. To produce smaller, more useful molecules
- C. To remove impurities from crude oil
- D. To convert alkenes into alkanes
Answer
The correct option is To produce smaller, more useful molecules.
Explanation
The correct option is To produce smaller, more useful molecules. To produce smaller, more useful molecules is correct because it directly supports the approved learning objective to state that the products of cracking include alkanes and alkenes. This belongs to Cracking and alkenes 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
Confusing Products of Cracking
Students often state that the products of cracking are only alkenes, forgetting that alkanes are also produced.
Remember that cracking produces both alkanes and alkenes. Review the definitions and examples of each to reinforce this understanding.
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