CAIE A-Level Chemistry AS 13.4 Structural Isomerism and Stereoisomerism Questions

Practise distinguishing structural isomers from stereoisomers and drawing chain, positional, functional, geometrical or optical forms.

Exam points

keep the molecular formula fixed while checking whether atom connectivity or only spatial arrangement changes
classify different connectivity as chain, positional or functional-group structural isomerism
classify identical connectivity with different 3D arrangement as geometrical or optical isomerism

Covered syllabus points

13.4.1—Structural isomerism and its division 13.4.2—Stereoisomerism and its division 13.4.3—Geometrical (cis/trans) isomerism in alkenes,13.4.4—Chiral centres and enantiomers 13.4.5—Chiral centres and geometrical (cis/trans)13.4.6—The possible isomers for an organic molecule

[Maximum number: 1]

Compound T has the skeletal formula shown.

compound T

Which structure is a structural isomer of compound T ?

Figure for Question 1 — CAIE A-Level Chemistry AS — Option A

Figure for Question 1 — CAIE A-Level Chemistry AS — Option B

Figure for Question 1 — CAIE A-Level Chemistry AS — Option C

Figure for Question 1 — CAIE A-Level Chemistry AS — Option D

[Maximum number: 1]

P and Q are a pair of cis-trans isomers.
What must be the same for P and Q ?
1 their empirical formula
2 their functional groups
3 their skeletal formula

1, 2 and 3 are correct

1 and 2 only are correct

2 and 3 only are correct

1 only is correct

[Maximum number: 1]

Which alkene shows geometric isomerism?

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{3}$ C

Figure for Question 3 — CAIE A-Level Chemistry AS — Option C

Figure for Question 3 — CAIE A-Level Chemistry AS — Option D

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Covered syllabus points

Question 1

Question 2

Question 3