IB Chemistry HL 3.2.7 Hl Stereoisomers Questions

Use real exam questions to identify geometric and optical isomers, locate chiral centres, draw enantiomers and justify three-dimensional arrangements.

Exam points

Define stereoisomers and distinguish cis-trans/E-Z geometric isomers from enantiomers using same constitution and different spatial arrangement.
Identify chiral centres and construct or interpret three-dimensional wedge-dash representations of non-superimposable mirror-image enantiomers.
Assign or use optical activity, polarimeter evidence and R/S or CIP priority rules to distinguish stereochemical configurations.

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Study 3.2.7 (HL)—Stereoisomers conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 3]

Organic compounds have many industrial applications.

(a)

The chloroalkene with the formula $\mathrm{C}_{4} \mathrm{H}_{7} \mathrm{Cl}$ can exist as several stereoisomers.

[ 3 ]

(i)

Draw the structural formula of cis-1-chlorobut-2-ene.

[ 1 ]

(ii)

Deduce the structure of a chloroalkene, $\mathrm{C}_{4} \mathrm{H}_{7} \mathrm{Cl}$ , that can exhibit optical isomerism, and identify the chiral carbon atom with an asterisk (*).

[ 2 ]

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IB Chemistry HL 3.2.7 Hl Stereoisomers Questions question 1

Question (a)

Question (i)

Question (ii)