How does this section build on the AS organic chemistry?

It extends the AS topic C3 (organic compounds, hydrocarbons, halogenoalkanes, alcohols and instrumental analysis) to aromatic chemistry, the carbonyl and acid-derivative families, nitrogen compounds, stereoisomerism and the full set of analytical techniques (adding NMR and chromatography to the AS mass spectrometry and infrared). The reaction map from C3 grows into the multi-step synthesis routes of OA4.

How is this section examined in Eduqas Chemistry?

It is examined mainly in Component 2 (Organic Chemistry and Analysis). Expect mechanism questions (electrophilic substitution, nucleophilic addition, addition-elimination), reaction-pathway and reagent questions, basicity and acidity comparisons, and structure deduction from NMR, infrared and mass spectra. The analytical techniques and synthesis also feature in the practical-focused Component 3.

What is the most common mistake in this section?

Treating benzene as if it undergoes addition (it substitutes), getting the direction of delocalisation wrong when explaining phenol and amine reactivity, confusing the reduction products of aldehydes and ketones, miscounting NMR environments or misapplying the n+1 splitting rule, and forgetting that alkaline ester hydrolysis goes to completion while acid hydrolysis is reversible.

EnglandChemistry

Eduqas A-Level Chemistry: Organic Chemistry and Analysis overview

Q: What does the Organic Chemistry and Analysis section of Eduqas Chemistry cover?

It covers OA1 higher concepts in organic chemistry (OA1.1 stereoisomerism, OA1.2 aromaticity), OA2 organic compounds containing oxygen (OA2.1 alcohols and phenols, OA2.2 aldehydes and ketones, OA2.3 carboxylic acids and their derivatives), OA3 organic compounds containing nitrogen (OA3.1 amines, OA3.2 amino acids, peptides and proteins) and OA4 organic synthesis and analysis (multi-step synthesis, chromatography and NMR spectroscopy).

A deep-dive overview of the Eduqas A-Level Organic Chemistry and Analysis section: stereoisomerism, aromaticity, alcohols and phenols, carbonyl compounds, carboxylic acids and derivatives, amines, amino acids, and synthesis and analysis.

Generated by Claude Opus 4.816 min readA420QS/OAUpdated 2026-06-02

Reviewed by: AI editorial process; not yet individually human-reviewed

Jump to a section

What this topic demands
Higher concepts: isomerism and aromaticity
Oxygen-containing compounds
Nitrogen-containing compounds
Synthesis and analysis
How this topic is examined
Check your knowledge

What this topic demands

The Organic Chemistry and Analysis section of Eduqas A-Level Chemistry is the largest organic block, extending the AS reactions into aromatic chemistry, the carbonyl and acid-derivative families, nitrogen compounds and a full analytical toolkit. The examiners reward accurate mechanisms, clear reasoning about acidity and basicity, and confident structure deduction from combined spectra.

This guide walks through the section in specification order and sets out the exam patterns Eduqas repeats. Each topic has a matching dot-point page with practice questions; this overview ties them together.

Higher concepts: isomerism and aromaticity

Stereoisomerism (OA1.1) covers E/Z isomerism from restricted rotation about a $\text{C=C}$ bond and optical isomerism from a chiral centre, with enantiomers, optical activity and the priority rules.

Aromaticity (OA1.2) covers the delocalised structure of benzene, the evidence for it (equal bond lengths, hydrogenation enthalpy, lack of addition), the stability it confers, and electrophilic substitution (nitration and halogenation).

Oxygen-containing compounds

Alcohols and phenols (OA2.1) contrasts phenol with aliphatic alcohols: its weak acidity (the delocalised phenoxide ion), the activation of the ring, and the distinguishing tests.

Aldehydes and ketones (OA2.2) covers the carbonyl group, nucleophilic addition (HCN and reducing agents), the oxidation of aldehydes only, and the Tollens, Fehling and dichromate tests.

Carboxylic acids and their derivatives (OA2.3) covers acidity, the derivatives (esters, acyl chlorides, anhydrides, amides) in order of reactivity, their interconversion, and ester hydrolysis.

Nitrogen-containing compounds

Amines (OA3.1) covers preparation, basicity (aliphatic stronger and aromatic weaker than ammonia), and reactions as bases and nucleophiles.

Amino acids, peptides and proteins (OA3.2) covers amphoteric behaviour and zwitterions, the isoelectric point, the peptide bond and its hydrolysis, and protein structure.

Synthesis and analysis

Organic synthesis and analysis (OA4) covers planning multi-step routes from the reaction map, chromatography (TLC and gas chromatography) and NMR spectroscopy (chemical shift, integration and the $n+1$ splitting rule), culminating in the synoptic deduction of a structure from combined spectra.

How this topic is examined

A typical Eduqas profile for this section:

Mechanisms. Electrophilic substitution of arenes, nucleophilic addition to carbonyls, and addition-elimination of acyl chlorides.
Acidity and basicity. Comparing phenol and alcohols, and aliphatic and aromatic amines, with delocalisation arguments.
Reaction pathways. Planning and completing multi-step syntheses with correct reagents and conditions.
Spectroscopy. Deducing structures from NMR (environments, integration, splitting), infrared and mass spectra together.

Check your knowledge

A mix of mechanism, reaction and analysis questions across the section. Attempt them under timed conditions, then check against the solutions.

State the two conditions required for E/Z isomerism. (2 marks)
Name the reaction and electrophile when benzene is nitrated. (2 marks)
Explain why phenol is more acidic than ethanol. (2 marks)
State the reagent and observation for a positive Tollens' test with an aldehyde. (2 marks)
Explain why ethylamine is a stronger base than ammonia. (2 marks)
State the splitting pattern of the $\text{CH}_3$ peak in the proton NMR spectrum of ethanol, and explain it. (2 marks)

Solutions

Q1: Restricted rotation (a $\text{C=C}$ double bond), and each carbon of the double bond carrying two different groups.
Q2: Electrophilic substitution (nitration); the electrophile is the nitronium ion $\text{NO}_2^+$ .
Q3: When phenol loses its proton, the negative charge on the phenoxide ion is delocalised into the ring, stabilising the ion, so phenol releases its proton more readily than ethanol.
Q4: Warm with Tollens' reagent (ammoniacal silver nitrate); a silver mirror forms on the tube as the aldehyde is oxidised and the silver ions reduced.
Q5: The alkyl group releases electron density onto the nitrogen (the positive inductive effect), making the lone pair more available to accept a proton, so ethylamine is a stronger base than ammonia.
Q6: A triplet. The $\text{CH}_3$ has two neighbouring $\text{CH}_2$ hydrogens, and by the $n+1$ rule $2 + 1 = 3$ peaks.

Sources & how we know this

WJEC Eduqas GCE A Level Chemistry specification (from 2015) — WJEC Eduqas (2015)