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A LevelChemistryOCRExam Questions4. Core Organic Chemistry4.1 Basic Concepts

Basic Concepts (OCR A Level Chemistry)

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4.1 Basic Concepts

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11 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

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21 mark

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

structural-isomersWhich pair of alcohols are structural isomers of each other?

  • E and F

  • E and G

  • E and H

  • F and G

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31 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

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    41 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

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    51 mark

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

    • C8H18

    • C9H18

    • C14H30

    • C11H24

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    61 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

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    71 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

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    81 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

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    91 mark

    Which of the reactions shows homolytic fission?

    • H3C+ + Cl– → H3C–Cl

    • H3C–Br → H3C+ + Br–

    • H3C–CH3 → H3C• + •CH3

    • Cl• + •CH3  → H3C–Cl

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    101 mark

    How many structural isomers have the molecular formula C6H14?

    • 3

    • 4

    • 5

    • 6

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    11 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

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    21 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 

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    3
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    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

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    41 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

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    51 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

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    61 mark

    How many alcohols have the formula C4H9OH?

    • 2

    • 3

    • 4

    • 5

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    71 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 ✓ ✓

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      81 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

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      91 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

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      101 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

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      11 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

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      21 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

       

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        31 mark

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

        • 7

        • 8

        • 9

        • 10

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        41 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

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        51 mark

        Which equation is correct?

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

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