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IB Chemistry HL 3.2.1 Organic Formulas Questions

Use real exam questions to interconvert molecular, empirical, displayed, skeletal and stereochemical formulas while preserving connectivity.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Convert molecular and empirical formulas and use atom counts or index-of-hydrogen-deficiency evidence to test a proposed organic structure.
  • Draw or identify full, condensed, displayed or skeletal structural formulas from names, reaction schemes, models and analytical constraints.
  • Interconvert organic representations while preserving connectivity, functional groups, ring or unsaturation information and specified stereochemical detail.

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Study 3.2.1—Organic formulas conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.2.1 Organic Formulas Questions question 1

[Maximum number: 1]

An organic compound, X, with a molar mass of approximately 88 g mol−188 \mathrm{~g} \mathrm{~mol}^{-1} contains 54.5 % carbon, 36.3 % oxygen and 9.2 % hydrogen by mass.

X is a straight-chain carboxylic acid. Draw its structural formula.

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