Question detail
What is the general formula for alkenes?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
- A. C_nH_{2n}
- B. C_nH_{2n+2}
- C. C_nH_{2n-2}
- D. C_nH_{2n+1}
Answer
The correct option is C_nH_{2n}.
Explanation
The correct option is C_nH_{2n}. C_nH_{2n} is correct because it directly supports the approved learning objective to write balanced equations for combustion reactions of alcohols. This belongs to Alcohols within Reactions of alkenes and alcohols (chemistry only), 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
Common Mistake in Combustion Equations
Students often forget to balance the number of carbon, hydrogen, and oxygen atoms in the combustion equations for alcohols.
Always check that the number of atoms of each element is the same on both sides of the equation. Practice balancing equations step by step.
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