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VCE Units 1–4 · Chemistry

VCE Chemistry — Organic Chemistry

Organic chemistry covers carbon-based compounds — their structures, naming, properties and reactions. In VCE, the key skills are identifying functional groups, using IUPAC naming, predicting products of reactions and explaining properties using intermolecular forces. This topic appears heavily in Units 1 and 2 and returns in Units 3 and 4.

Key Concepts & Formulas

  • Functional groups: alkane (C–C), alkene (C=C), alkyne (C≡C), alcohol (–OH), carboxylic acid (–COOH), ester (–COO–), amine (–NH₂), amide (–CONH–)

  • IUPAC naming: identify longest carbon chain → number from end closest to functional group → name substituents as prefixes

  • Homologous series: compounds differing by –CH₂– units; same functional group and similar chemical properties

  • Addition reaction: unsaturated compound + reagent → saturated product (e.g. alkene + Br₂)

  • Substitution reaction: atom/group replaced by another (e.g. halogenation of alkanes)

  • Elimination reaction: atoms removed to form a double bond (e.g. dehydration of alcohol → alkene)

  • Condensation reaction: two molecules join with loss of small molecule (H₂O or HCl)

  • Esterification: alcohol + carboxylic acid → ester + water (reversible; needs acid catalyst)

  • Polymers: addition polymers from alkenes (e.g. polyethylene); condensation polymers from bifunctional monomers (e.g. nylon, polyester)

  • Boiling point trends: increases with chain length (more dispersion forces) and with hydrogen bonding capacity

Practice Questions

5 questions

Attempt each question before reading the hint. These are styled to match VCE exam format.

Q1.Name the compound CH₃CH₂CH(OH)CH₃.

1 mark
Show hint

The longest chain has 4 carbons. Number from the end closest to the OH group.

Q2.Write the structural formula of the ester formed from ethanol and propanoic acid. Name the ester.

3 marks

Q3.Describe the reaction of propene with hydrogen bromide. Identify the reaction type and write the product.

3 marks

Q4.Explain why butan-1-ol has a higher boiling point than butanal (both C₄H₈O), even though they have the same molecular formula.

3 marks

Q5.A monomer is HO–CH₂CH₂–COOH. Draw two repeat units of the polymer formed and identify the reaction type.

3 marks

Common Mistakes to Avoid

These are the errors that VCE students most frequently make in Organic Chemistry — and that examiners are specifically watching for.

  • Numbering the carbon chain from the wrong end — always number to give the lowest locants to functional groups

  • Confusing addition and substitution reactions — addition adds across a double bond; substitution replaces an atom

  • Writing the ester linkage incorrectly: it is –COO– not –OOC– (the carbonyl comes from the acid)

  • Attributing boiling point differences purely to molecular mass without mentioning intermolecular force type

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