IBChemistrySLTopic QuestionsClassification of MatterFunctional Groups: Classification of Organic Compounds

Syllabus Edition

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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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 Calculator1 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 Calculator1 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

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
Sme Calculator1 mark

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

  • 3

  • 4

  • 5

  • 6

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10
Sme Calculator1 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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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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