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IBChemistry: HLDPExam Questions20. Organic Chemistry (HL only)20.3 Stereoisomerism

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First teaching 2014

Last exams 2024

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Stereoisomerism (DP IB Chemistry: HL)

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20.3 Stereoisomerism

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20.3 Stereoisomerism

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1
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Which molecule contains a chiral carbon?

  • 1-chloro-2-methylbutane

  • 2-methylpropane

  • Butane

  • 2-chloropropane

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2
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What is name of this compound applying IUPAC rules?

1f99b13b-fc61-4666-855a-a545bf627b9a

  • Trans-pent-2-ene

  • Trans-but-2-ene

  • But-1-ene

  • Cis-but-2-ene

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3
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Which compound can exist as optical isomers?

  • CH3CH2CH2OH

  • CH3CHOHCH3

  • CH3CHOHCH2CH3

  • CH2CHCH3

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4
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Which statement about isomerism is correct?

  • A racemic mixture is optically active 

  • Pent-1-ene exhibits stereoisomerism 

  • 1-bromopropane has two optical isomers 

  • 2-amino-3-methylpentane is a diastereomer

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5
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Which pair are cis and trans isomers?

  • aIKHR5cw_20-3-a-ib-mcq

  • 20-3-b---ib-mcq

  • 20-3-c---ib-mcq

  • 20-3-d---ib-mcq

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11 mark

Which two molecules are cis-trans isomers of each other?

q1_16-2_ib_hl_medium_mcq

  • X and Z

  • X and Y

  • W and Y

  • W and Z

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21 mark

What is this molecule called?
q2_20-3_ib_hl_medium_mcq

  • Z-2-bromo-1-chloro-2-fluoroethene

  • E-2-bromo-1-chloro-2-fluoroethene

  • Z-1-bromo-2-chloro-1-fluoroethene

  • E-1-bromo-2-chloro-1-fluoroethene

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31 mark

Which molecule has optical isomers?

  • 2-bromobutane

  • 1,3-dibromopropane

  • 2-chloro-2-methylpropane

  • 3-bromopentane

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41 mark

Which is true about stereoisomerism?

  • But-1-ene has E/Z isomers

  • Butan-2-ol has two enantiomers

  • But-1-ene and but-2-ene are cis-trans isomers

  • Butan-1-ol and butan-2-ol are optical isomers

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1
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How many five ringed membered isomers are there of dimethyl cyclopentane? 

  • 3

  • 4

  • 5

  • 6

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2
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Which structure is the correct cis trans isomer of trans-1,2-dibromocyclobutane? 

  • 071e94cd-60a9-4a2d-ae93-5b18d9c18acb

     

  • IB 20.3 MCQ H Option B

     

  • IB 20.3 MCQ H Option C

     

  • 69b446c6-efd4-42a0-b85c-f2145b750414

     

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3
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Which molecule has a chiral centre? 

  • CH3OCH2CH3

  • CH3CH2CHO

  • CH3CH(NH2)CH3

  • CH3CH(OH)CH2CH3

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4
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Which of the following statements is correct? 

I. 2-bromo-1-chloro-1-fluoropropene can not be classed as a cis or trans isomer

II. A polarimeter measures the configuration of a molecule as R or S

III. Conformational isomers occur due to the free rotation about a single σ-bond

  • I and II only 

  • I and III only 

  • II and III only 

  • I, II and III

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5
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Arthrinin-F is a compound isolated from fungus.

1-1

What is the correct number of chiral carbons in the structure?

  • 2

  • 3

  • 4

  • 5

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