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AS Chemistry Revision (Intro to Organic Chemistry)

Quiz I made for myself, but feel free to have a go. Notes: follows the AQA spec, covers spec points under topic 3.3.1. (https://www.aqa.org.uk/subjects/chemistry/as-level/chemistry-7404/specification/subject-content/organic-chemistry)
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forgivexmexoscar
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Last updated: April 5, 2026
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First submittedApril 5, 2026
Times taken4
Average score61.9%
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Hint
Answer
Empirical formula
Simplest whole number ratio of atoms of each element in a molecule.
Molecular formula
Actual number of atoms of each element in a molecule.
Structural formula
Shows arrangement of atoms without showing all the bonds (each carbon is written separately with the atoms/groups that are attached to it).
Displayed formula
Shows every atom and every bond in the molecule.
Skeletal formula
Straight lines represent carbon-carbon bonds (the atoms themselves are not drawn).
Homologous series
Series of organic compounds containing the same functional group.
Characteristics of a homologous series
Same general formula. Same chemical reactions. Same functional groups. Molecules increase by CH₂.
Low(er) priority functional groups
Halogens, alkyl groups, alkenes (lowest to highest).
High(er) priority functional groups
Alcohols, carboxylic acids, ketones, aldehydes (in no particular order).
Structural isomers
Molecules with the same molecular formula, but different structural formulae.
Chain isomers
Same functional groups, but a different arrangement of the carbon skeleton.
Hint
Answer
Position(al) isomers
Same functional groups, attached to the main chain at different points.
Functional group isomers
Same atoms arranged into different functional groups.
Functional group isomer of aldehydes
Ketones
Functional group isomer of alcohols
Ethers
Functional group isomer of alkenes
Cycloalkanes
Functional group isomer of carboxylic acids
Esters
Stereoisomers
Molecules with the same structural formula but atoms are arranged differently in space.
E-isomers are?
Opposite
Z-isomers are?
Together
Conditions for stereoisomerism
Restricted rotation about carbon-carbon bond. Two different groups attached to each carbon in the carbon-carbon bond.
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