CAIE A-Level Chemistry AS 13.4.6 The Possible Isomers for an Organic Molecule Questions

Practise deriving, drawing and counting the possible structural and stereoisomers for a known molecular formula while applying functional-group, ring and reaction constraints in…

Exam points

derive the possible structural isomers from a known molecular formula while applying the stated functional-group, chain, ring or reaction constraints
include stereoisomers when the question requires them, checking chiral centres and restricted C=C geometry rather than counting connectivity alone
draw or count the valid structures systematically and avoid duplicates by comparing connectivity and spatial arrangement

[Maximum number: 2]

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

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

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

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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CAIE A-Level Chemistry AS 13.4.6 The Possible Isomers for an Organic Molecule Questions question 1