Chapter 1: Organic Formulae, Nomenclature and Isomerism

A-level ChemistryModule 4: Core Organic Chemistry7 topicsHigher

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Releases 1 August 2026

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Module 4: Core Organic Chemistry: Organic Formulae, Nomenclature and Isomerism - Authored Long Answer Questions

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4 questions25 marks37.5 min

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6 marksdescribestandardOCR A

For Organic Formulae, Nomenclature and Isomerism, describe how IUPAC nomenclature and structural isomerism applies to C4H9Br structural isomers.

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6 markscalculatehardOCR A

Using C4H9Br structural isomers, calculate a relevant OCR A Organic Formulae, Nomenclature and Isomerism quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Organic Formulae, Nomenclature and Isomerism: Carbon chain length (carbon atoms) vs Number of structural isomers (no.)

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The graph for Organic Formulae, Nomenclature and Isomerism shows data from C4H9Br structural isomers. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In C4H9Br structural isomers, evaluate the experimental method or model assumptions used when applying IUPAC nomenclature and structural isomerism.

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Start of Module 4: Core Organic Chemistry

2. Mechanisms and Curly-Arrow Logic

Key learning objectives

Understand the key principles behind Organic Formulae, Nomenclature and Isomerism.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.