IBChemistryDPSLExam QuestionsClassification of MatterFunctional Groups: Classification of Organic Compounds

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

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Functional Groups: Classification of Organic Compounds

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1
1 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  

Choose your answer

2
1 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

Choose your answer

3
1 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

Choose your answer

4
1 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

   

    Choose your answer

    5
    1 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

      Choose your answer

      6
      1 mark

      Which of the following is the displayed formula for ethylamine?

      Four molecular structures labelled A to D, each with carbon, nitrogen, and hydrogen atoms in different configurations, are shown horizontally.

        Choose your answer

        7
        1 mark

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

        • C5H12

        • C6H12

        • C7H16

        • C8H18

        Choose your answer

        8
        1 mark

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

        10-1-q7-ib-chemisrey-mcq

        • hydroxyl

        • carboxyl

        • ether

        • carbonyl

        Choose your answer

        9
        1 mark

        What is the IUPAC name of the following molecule?

        Structural formula of 2-chloro-2-methylbutane, showing carbon chain with chlorine and methyl groups attached to the second carbon.

        •  2-chloro-3-ethylbutane

        • 3-methyl-4-chloropentane

        • 2-ethyl-3-chlorobutane

        • 2-chloro-3-methylpentane

        Choose your answer

        10
        1 mark

        What is the IUPAC name of the following molecule?

        Structural formula of isobutyric acid, showing a chain of carbon atoms bonded to hydrogen and an OH group, with a double-bonded oxygen.

        • 3,3-dimethylpropanoic acid

        • 1,1-dimethylpropanoic acid

        • 3-methylbutanoic acid

        • 2-methylbutanoic acid

        Choose your answer

        11
        1 mark

        Which of the halogenoalkanes shown contains a secondary carbon atom?

        • (CH3)2CHCH2Cl

        • CH3(CH2)3CH2Cl

        • (CH3)3CCl

        • CH3CHClCH2CH3

        Choose your answer

        1
        1 mark

        Xylitol is an artificial sweetener used in toothpastes and chewing gum to improve their taste without impairing dental hygiene.

        Chemical structure of xylitol showing a chain of five carbon atoms, each bonded to hydroxyl groups, with the name "Xylitol" labelled below.

        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

        Choose your answer

        2
        1 mark

        How many structural isomers are there of tribromopropane, C3H5Br3?

        • 4

        • 5

        • 6

        • 7

        Choose your answer

        3
        1 mark

        How many isomeric esters have the molecular formula C5H10O2?

        • 4

        • 5

        • 9

        • 7

        Choose your answer

        4
        1 mark

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

        I. all members have the same general formul

        II. the members have similar chemical properties

        III. 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

        Choose your answer

        5
        1 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

        Choose your answer

        6
        1 mark

        Give the name of the following molecule

        Chemical structure diagram of a 2,2,4-trimethylpentane molecule, showing carbon and hydrogen atoms connected by single bonds in a branched layout.

        • 2,4,4,4-trimethylethylbutane

        • 3,3,5-trimethylhexane

        • 2,4,4-trimethylhexane

        • 1,1,3,3-tetramethylpentane

        Choose your answer

        7
        1 mark

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

        • 2

        • 3

        • 4

        • 5

        Choose your answer

        8
        1 mark

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

        Diagram of hexene molecular structure, showing carbon (C) and hydrogen (H) atoms linked, depicting a six-carbon hydrocarbon chain with a double bond.

        I.  A suitable name is hex-4-ene

        II.  The empirical formula is CH2

        III.   It is an isomer of cyclohexane

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

        Choose your answer

        9
        1 mark

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

        • CH3CH2CH2OOCH3 

        • CH3CH2CH2COCH3

        • CH3CH2OCH2CH3

        • CH3CH2CH2CH2CHO

        Choose your answer

        10
        1 mark

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

        • CH3CH2CH2Cl

        • CH3CH2CH(CH3)Br

        • C(CH3)3Cl

        • CH3CHBrCH2CH3

        Choose your answer

        11
        1 mark

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

        Skeletal model of isopentane with carbon atoms connected in a chain and surrounded by hydrogen atoms, forming a branched alkane structure.

        • pentane

        • ethylpropane

        • 2-methylbutane

        • 3-methylbutane

        Choose your answer

        12
        1 mark

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

        Structural formulas of four molecules labelled W, X, Y, Z, with variations of butenoic acid structures showing different configurations of carboxyl groups.

        • X and Z

        • X and Y

        • W and Y

        • W and Z

        Choose your answer

        13
        1 mark

        What is this molecule called?

        Structural formula of a halogenated alkene with two carbon atoms doubly bonded, attached to bromine, chlorine, fluorine, and hydrogen.

        • 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

        Choose your answer

        14
        1 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

        Choose your answer

        1
        1 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

        Choose your answer

        2
        1 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

        Choose your answer

        3
        1 mark

        What is the correct IUPAC name for the molecule shown?

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

        • ethoxyethane

        • methoxyethane

        • propanone

        • propanal

        Choose your answer

        4
        1 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

        Choose your answer

        5
        1 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

        Choose your answer

        6
        1 mark

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

        Diagram of a propionic acid molecule showing three carbon, six hydrogen, and two oxygen atoms connected by bonds in a linear arrangement.

        • propyl methanoate

        • methyl propanoate

        • methoxypropane

        • butoxymethanal

        Choose your answer

        7
        1 mark

        What types of isomerism can the following molecule show?

        Molecular structure of butyl ethanoate, showing carbon, hydrogen, and oxygen atoms with single and double bonds in a linear and branched arrangement.

        I. Branch-chain

        II. Positional 

        III. Functional group

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

        Choose your answer