Question detail
What does the variable n represent in the alkane formula C_nH_{2n+2}?
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. Number of hydrogen atoms
- B. Number of carbon atoms
- C. Number of double bonds
- D. Number of functional groups
Answer
The correct option is Number of carbon atoms.
Explanation
The correct option is Number of carbon atoms. Number of carbon atoms is correct because it directly supports the approved learning objective to state the general formula for the homologous series of alkanes as CnH2n+2. This belongs to Crude oil, hydrocarbons and alkanes 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
General Formula Confusion
Students often confuse the general formula for alkanes with that of alkenes, stating it as CnH2n instead of CnH2n+2.
Remember that alkanes are saturated hydrocarbons with the general formula CnH2n+2, while alkenes are unsaturated with the formula CnH2n.
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