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CAIE A-Level Chemistry 13.4.6 Deducing Organic Isomers

Practise generating all valid structural and stereoisomers from a molecular formula without duplicates.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • calculate unsaturation where useful, then enumerate distinct carbon skeletons before adding functional groups
  • vary group or multiple-bond positions systematically and reject structures related only by renumbering
  • add geometrical or optical forms only after checking the structural requirements for stereoisomerism

13.4.6—The possible isomers for an organic molecule question 1

[Maximum number: 2]

The alkanes are a homologous series of organic molecules. Alkanes are generally unreactive and are commonly used as fuels.

Hexane, C6H14\mathrm{C}_{6} \mathrm{H}_{14}, has four structural isomers.

Fig. 3.1 shows hexane and two of its structural isomers.

Fig. 3.1

Fig. 3.1

Complete Fig. 3.1 by drawing structures for C and D, the other two structural isomers of hexane.

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