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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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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  

Choose your answer

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

Choose your answer

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

Choose your answer

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

   

    Choose your answer

    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

      Choose your answer

      61 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

        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

        Choose your answer

        81 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

        91 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

        101 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

        111 mark

        Which of the halogenoalkanes shown contains a secondary carbon atom?

        • (CH3)2CHCH2Cl

        • CH3(CH2)3CH2Cl

        • (CH3)3CCl

        • CH3CHClCH2CH3

        Choose your answer

        11 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

        21 mark

        How many structural isomers are there of tribromopropane, C3H5Br3?

        • 4

        • 5

        • 6

        • 7

        Choose your answer

        31 mark

        How many isomeric esters have the molecular formula C5H10O2?

        • 4

        • 5

        • 9

        • 7

        Choose your answer

        41 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

        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

        Choose your answer

        61 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

        71 mark

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

        • 2

        • 3

        • 4

        • 5

        Choose your answer

        81 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

        91 mark

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

        • CH3CH2CH2OOCH3 

        • CH3CH2CH2COCH3

        • CH3CH2OCH2CH3

        • CH3CH2CH2CH2CHO

        Choose your answer

        101 mark

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

        • CH3CH2CH2Cl

        • CH3CH2CH(CH3)Br

        • C(CH3)3Cl

        • CH3CHBrCH2CH3

        Choose your answer

        111 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

        121 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

        131 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

        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

        Choose your answer

        11 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

        21 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

        31 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

        41 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

        51 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

        61 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

        71 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