A LevelChemistryOCRExam Questions4. Core Organic ChemistryBasic Concepts

Basic Concepts (OCR A Level Chemistry A): Exam Questions

Exam code: H432

3 hours40 questions

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Basic Concepts

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1
1 mark

What is the name of the following compound?

23-dichloro-2-methylbutane

  • 1,2-dichloro-1,2-dimethylpropane

  • 2,3-dichloro-2,3-dimethylpropane

  • 2,3-dichloro-2-methylbutane

  • 2,3-dichloro-3-methylbutane

Choose your answer

2
1 mark

The skeletal formulae of four alcohols, E, F, G and H, are shown below.

structural-isomers

Which pair of alcohols are structural isomers of each other?

  • E and F

  • E and G

  • E and H

  • F and G

Choose your answer

3
1 mark

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

A

Structural

CH2FCH2C(CH3)CH3

B

Displayed

displayed-formula-2

C

Empirical

C5H9F

D

Skeletal

3-1-q3-skeletal

    Choose your answer

    4
    1 mark

    What is the correct meaning of the term structural isomer?

    • A compound that contains a different molecular formula and the atoms are arranged differently in space

    • A compound that contains the same structural formula but the atoms are arranged differently in space

    • A compound with the same empirical formula but different structural formula

    • A compound with the same molecular formula but different structural formula

    Choose your answer

    5
    1 mark

    Which of the hydrocarbons shown below does not belong in the same homologous series as the other compounds?

    • C8H18

    • C9H18

    • C14H30

    • C11H24

    Choose your answer

    6
    1 mark

    What is the identity of the functional group that is ringed in the molecule shown below?

    3-1-q6-functional-group

    • Aldehyde

    • Ketone

    • Carboxylic acid

    • Alkene

    Choose your answer

    7
    1 mark

    What is the IUPAC name of the following molecule?

    2-chloro-3-methylpentane

    • 2-chloro-3-methylpentane

    • 3-methyl-4-chloropentane

    • 2-ethyl-3-chlorobutane

    • 2-chloro-3-ethylbutane

    Choose your answer

    8
    1 mark

    When propan-1-ol is heated under reflux in the presence of concentrated sulfuric acid, propene is formed. 

    propan-1-ol-elimination

    What type of reaction is this?

    • Neutralisation

    • Addition

    • Substitution

    • Elimination

    Choose your answer

    9
    1 mark

    Which of the reactions shows homolytic fission?

    • H3C+ + Cl– → H3C–Cl

    • H3C–Br → H3C+ + Br–

    • H3C–CH3 → H3C• + •CH3

    • Cl• + •CH3  → H3C–Cl

    Choose your answer

    10
    1 mark

    How many structural isomers have the molecular formula C6H14?

    • 3

    • 4

    • 5

    • 6

    Choose your answer

    1
    1 mark

    What is the systematic name of the compound below?

    2-hydroxy-3-methylpropanal

    • 1-carbonyl-2-methylpropan-3-ol

    • 3-hydroxy-2-methylpropanal

    • 2-methoxypropan-1-ol

    • 2-methyl-3-hydroxypropanone

    Choose your answer

    2
    1 mark

    The skeletal formula of an organic compound is shown below.

    4-hydroxy-33-dimethylpropan-2-one-skeletal

    What is the molecular formula of the organic compound?

    • C7H12O2 

    • C7H13O2 

    • C7H14O2 

    • C7H15O2 

    Choose your answer

    3
    Sme Calculator
    1 mark

    Propanone is the simplest compound in the homologous series of ketones.

    What is the general formula for the homologous series of ketones?

    • C3H6O

    • CnH2n-1O

    • CnH2nO

    • CnH2n+1O

    Choose your answer

    4
    1 mark

    How can the molecule below be described?

    2-methylcyclohexa-1-3-diene-skeletal

    • Aromatic and alicyclic

    • Aliphatic and saturated

    • Alicyclic and saturated

    • Alicyclic and unsaturated

    Choose your answer

    5
    1 mark

    Which compound(s) is a / are structural isomer(s) of C6H12O?

    1. Cyclohexanol

    2. Hexan-3-one

    3. 2,3-dimethylbut-3-en-2-ol

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1

    Choose your answer

    6
    1 mark

    How many alcohols have the formula C4H9OH?

    • 2

    • 3

    • 4

    • 5

    Choose your answer

    7
    1 mark

    Which statement(s) is / are correct for the organic compound below?

    pent-2-ene-skeletal

     

    IUPAC name is pent-3-ene

    The empirical formula is CH2 

    It is an isomer of cyclopentane

    A

    ✓

    ✓

    ✓

    B

    ✓

    ✓

    X

    C

    ✓

    X

    ✓

    D

    X

    ✓

    ✓

      Choose your answer

      8
      1 mark

      Which statement(s) is / are correct about bond fission?

      1. Each bonding atom receives one electron from the bonding pair in heterolytic fission

      2. Radicals are formed during homolytic fission

      3. Heterolytic fission forms anions and cations

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      9
      1 mark

      Which diagram shows the heterolytic fission of the C-Cl bond to form a carbocation and Cl–?

      • ocr-as-4-1m-mcq-q9-heterolytic-fission-of-chloropropane-cl
      • ocr-as-4-1m-mcq-q9-heterolytic-fission-of-chloropropane-cl-
      • ocr-as-4-1m-mcq-q9-heterolytic-fission-of-chloropropane-2--ve-ions
      • ocr-as-4-1m-mcq-q9-homolytic-fission-of-chloropropane

      Choose your answer

      10
      1 mark

      Which statement(s) is / are correct about the members of a homologous series?

      1. All members have the same general formula

      2. The members have similar chemical properties

      3. The members show a gradual change in physical properties

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

      Choose your answer

      1
      1 mark

      What is the correct IUPAC name for the following molecule?

      ocr-as-4-1h-mcq-q1-molecule

      • 4-ethyl-1,2,3-trimethylpent-2-ene

      • 3,4,5-trimethylhept-4-ene

      • 5-ethyl-3,4-dimethylhex-3-ene

      • 3,4,5-trimethylhept-3-ene

      Choose your answer

      2
      1 mark

      Which row is correct?

       

      IUPAC name

      General formula

      Skeletal formula

      Structural formula

      A

      2-methylpropanal

      CnH2n+1O

      2-methylpropanal

      CH3CH(CH3)CHO

      B

      4-methylpentylamine

      CnH2n+1NH2

       

      4-methylpentylamine

      CH3CH2CH2CH(CH3)CH2NH2

      C

      4-methylhexan-2-one

      CnH2nO

      4-methylhexan-2-one

      CH3CH2CH(CH3)CH2COCH3

      D

      ethyl propanoate

      CnH2nO2

       

      ethyl-propanoate

      CH3COOCH2CH2CH3

       

        Choose your answer

        3
        1 mark

        How many isomers are there of C5H13N which are primary amines?

        • 7

        • 8

        • 9

        • 10

        Choose your answer

        4
        1 mark

        Which pair of molecules show structural isomerism?

        • E-but-2-ene and Z-but-2-ene

        • Propanone and propan-2-ol

        • 2-methyl-3-ethylbutane and 2,3-dimethylpentane

        • Butanoic acid and methyl propanoate

        Choose your answer

        5
        1 mark

        Which equation is correct?

        ocr-as-4-1h-mcq-q5-curly-arrows

          Choose your answer