IBChemistrySLTopic QuestionsClassification of MatterFunctional Groups: Classification of Organic Compounds

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First teaching 2023

First exams 2025

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Functional Groups: Classification of Organic Compounds (SL IB Chemistry)

Topic Questions

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Functional Groups: Classification of Organic Compounds

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Functional Groups: Classification of Organic Compounds

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11 mark

Which of the following shows the correct order of boiling points for pentane, butane and propane?

  • CH3CH2CH3 > CH3CH2CH2CH3 > CH3CH2CH2CH2CH3

  • CH3CH2CH2CH2CH3 > CH3CH2CH2CH3 > CH3CH2CH3

  • CH3CH2CH2CH3 > CH3CH2CH2CH2CH3 > CH3CH2CH3 

  • CH3CH2CH3 > CH3CH2CH2CH2CH3 > CH3CH2CH2CH3  

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21 mark

Which pairs of homologous series do not have the same C:H ratio in their general formulae?

  • aldehydes and ketones

  • alkanes and alkenes

  • carboxylic acids and esters

  • alkenes and aldehydes

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31 mark

Which of the following molecules are hydrocarbons?

10-1-q2-ib-chemisrey-mcq

  • All

  • 1 and 2

  • 1, 2 and 3

  • 2, 3 and 4

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41 mark

What is the correct formula for 1-fluoro-3-methylbut-2-ene?

          A           

                     Molecular                          

         CH2FCH2C(CH3)CH3

B

Empirical

C5H9F

C

Displayed

 10-1-q3-ib-chemisrey-mcq

D

Skeletal

 

10-1-e-q3-ib-chemistry-mcq    

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    51 mark

    Considering only structural isomers, what is the number of alcohols of each type with the formula C5H12O?

                 

             primary        

           secondary      

          tertiary    

    A

    B

    C

    D

    3

    4

    4

    5

    3

    2

    3

    2

    2

    2

    1

    1

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      61 mark

      Which of the following is the displayed formula for ethylamine?

      10-1-q5-ib-chemisrey-mcq

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        71 mark

        Identify which of the hydrocarbons shown below does not belong in the same homologous series as the other compounds

        • C5H12

        • C6H12

        • C7H16

        • C8H18

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        81 mark

        Identify the functional group that is ringed in the molecule shown below:

        10-1-q7-ib-chemisrey-mcq

        • hydroxyl

        • carboxyl

        • ether

        • carbonyl

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        91 mark

        What is the IUPAC name of the following molecule?10-1-q8-ib-chemisrey-mcq

        •  2-chloro-3-ethylbutane

        • 3-methyl-4-chloropentane

        • 2-ethyl-3-chlorobutane

        • 2-chloro-3-methylpentane

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        101 mark

        What is the IUPAC name of the following molecule?10-1-q9-ib-chemisrey-mcq

        • 3,3-dimethylpropanoic acid

        • 1,1-dimethylpropanoic acid

        • 3-methylbutanoic acid

        • 2-methylbutanoic acid

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        111 mark

        Which of the halogenoalkanes shown contains a secondary carbon atom?

        • (CH3)2CHCH2Cl

        • CH3(CH2)3CH2Cl

        • (CH3)3CCl

        • CH3CHClCH2CH3

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        12
        Sme Calculator        1 mark

        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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        13
        Sme Calculator        1 mark

        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

        Xylitol is an artificial sweetener used in toothpastes and chewing gum to improve their taste without impairing dental hygiene.10-2-m-q1-ib-chemistry-mcqs

        Which functional groups could be produced if Xylitol is oxidised under suitable conditions?

         

        1

                      alkene

        2

                      aldehyde

        3

                      carboxylic acid

        4

                      ketone

        • 1 only

        • 2 only

        • 2, 3 and 4

        • 2 and 4

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        21 mark

        How many structural isomers are there of tribromopropane, C3H5Br3?

        • 4

        • 5

        • 6

        • 7

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        31 mark

        How many isomeric esters have the molecular formula C5H10O2?

        • 4

        • 5

        • 9

        • 7

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        41 mark

        Which features about the members of a homologous series are correct?

        1.  all members have the same general formul
        2.  the members have similar chemical properties
        3.  the members show a gradual change in physical properties

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        51 mark

        Octane is a component of petrol or gasoline. Which of the following molecules could be an isomer of octane?

        • CH3CH2CHCHCHCH2(CH3)2

        • (CH3)2CHCH(CH2)2(CH3)2

        • CH3(CH2)5CH3

        • CH3CHCHCH(CH2)2(CH3)2

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        61 mark

        Give the name of the following molecule10-1-m-q5-mcqs-ib-chemistry

        • 2,4,4,4-trimethylethylbutane

        • 3,3,5-trimethylhexane

        • 2,4,4-trimethylhexane

        • 1,1,3,3-tetramethylpentane

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        71 mark

        How many branched-chain isomers are there which have the molecular formula C5H12?

        • 2

        • 3

        • 4

        • 5

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        81 mark

        Study the diagram below and determine which of the three statements are correct

        10-1-m-q8-mcqs-ib-chemistry

        1.   A suitable name is hex-4-ene
        2.   The empirical formula is CH2
        3.    It is an isomer of cyclohexane

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        91 mark

        Which of the molecules shown below contains an aldehyde functional group?

        • CH3CH2CH2OOCH3 

        • CH3CH2CH2COCH3

        • CH3CH2OCH2CH3

        • CH3CH2CH2CH2CHO

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        101 mark

        Which of the halogenoalkanes shown below contains a tertiary carbon atom?

        • CH3CH2CH2Cl

        • CH3CH2CH(CH3)Br

        • C(CH3)3Cl

        • CH3CHBrCH2CH3

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        111 mark

        What would be the name of the following compound using IUPAC rules?

        10-1-m-q10-mcqs-ib-chemistry

        • pentane

        • ethylpropane

        • 2-methylbutane

        • 3-methylbutane

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        121 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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        131 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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        141 mark

        What is the name of this molecule?
        q4_20-3_ib_hl_medium_mcq

        • cis-3-methyl-3-hexene

        • trans-4-methyl-4-hexene

        • cis-3-methyl-2-hexene

        • trans-3-methyl-2-hexene

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        11 mark

        How many isomers, including structural and stereoisomers, with the formula C5H10 have structures that involve π bonding?

        • 3

        • 4

        • 5

        • 6

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        21 mark

        Study the formulae shown below and determine which molecules are isomers of each other

        I.
        CH3(CH2)3CH2CH3
        II.
        (CH3)2CHCH2CH3
        III.
        CH3CH(CH3)CH2CH2CH3

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        31 mark

        What is the correct condensed structural formula for 2,2-dibromo-4-methylhexane?

        • CH3CBr2CH(CH3)CH2CH2CH3

        • CH3CHBrCBr(CH3)CH2CH2CH3

        • CH3CBr2CH2CH(CH3)CH2CH3

        • CH3CHBrCH(CH3)CHBrCH2CH3

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        41 mark

        What is the correct IUPAC name for the molecule shown?

        10-1-h-q4-mcqs-ib-chemistry

        • ethoxyethane

        • methoxyethane

        • propanone

        • propanal

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        51 mark

        Which of the molecules shown below is not an isomer of pentan-2-ol?

        • pentan-1-ol

        • 2-methylbutan-2-ol

        • 2-methylpentan-2-ol

        • pentan-3-ol

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        61 mark

        Which of the following pairs are functional group isomers?

        I.
        CH3CH(OH)CH2CH2CH3 and CH3CH2CH(OH)CH2CH3
        II.
        CH3CH2CH2COOH and HCOOCH2CH2CH3
        III.
        CH3CH2CH2OH and CH3OCH2CH3

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        71 mark

        What is the correct name of the following molecule using IUPAC rules?

        10-1-h-q8-mcqs-ib-chemistry

        • propyl methanoate

        • methyl propanoate

        • methoxypropane

        • butoxymethanal

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        81 mark

        What types of isomerism can the following molecule show?

        10-1-h-q9-mcqs-ib-chemistry

        I.
        Branch-chain
        II.
        Positional 
        III.
        Functional group

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

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        9
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        How many five ringed membered isomers are there of dimethyl cyclopentane? 

        • 3

        • 4

        • 5

        • 6

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        10
        Sme Calculator        1 mark

        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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