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A LevelChemistryOCRExam Questions6. Organic Chemistry & AnalysisAnalytical Techniques

Analytical Techniques (OCR A Level Chemistry A): Exam Questions

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11 mark

The structure of 2-chloropropane is shown below.

2-chloropropane

Which description of the peaks in the 1H NMR spectrum of 2-chloropropane is correct?

  • 1 peak with a relative intensity of 6

  • 2 peaks with relative intensities of 3 : 4

  • 3 peaks with relative intensities of 3 : 1 : 3

  • 2 peaks with relative intensities 6 : 1

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21 mark

How many peaks will be shown in the low-resolution 1H NMR spectrum of propanal?

propanal

  • 2

  • 3

  • 4

  • 6

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31 mark

A suitable carrier gas for use in gas-liquid chromatography is:

  • Carbon dioxide

  • Chlorine

  • Nitrogen

  • Oxygen

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41 mark

In chromatography, which of the following can be the mobile phase?

  • Liquid only

  • Liquid or gas

  • Solid or liquid

  • Gas only

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51 mark

Primary alcohols can be oxidised to aldehydes.

Which statement shows the correct reagents and observations for this reaction?

 

Reagent 

Observation

A

Acidified silver nitrate solution

White precipitate forms

B

Fehling’s solution

Brick-red precipitate forms

C

Tollens’ reagent 

Silver mirror forms

D

Acidified potassium dichromate

Colour change from orange to green

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    1
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    A chromatogram of two compounds, A and B, is shown.

    tlc-exam-question

    What is the Rf value of compound B?

    • 0.21

    • 0.44

    • 0.65

    • 1.54

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    21 mark

    Which of the following do components with a high Rf value have a greater affinity for?

    • No phase

    • The mobile phase

    • The stationary phase

    • The latent phase

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    31 mark

    Which statement(s) is / are correct for gas chromatography?

    1. The relative peak areas give the proportions of components in a mixture.

    2. The components in a mixture can be identified from their retention time.

    3. The components in a mixture are separated by their force of attraction to the liquid phase.

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1

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    41 mark

    Functional group analysis is performed on E-4-chloropen-2-ene below.

    2e-4-chloro-2-pentene-skeletal

    Which statement(s) is / are correct about the chemical tests performed?

    1. Warming with silver nitrate and ethanol will form a white precipitate

    2. Bromine water will change from orange to green

    3. Warming with Tollens' reagent will form a silver mirror

    • 1, 2 and 3

    • Only 1 and 2

    • Only 2 and 3

    • Only 1 

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    51 mark

    Which chemical test and observation for 2-oxobutanol is correct?

    2-oxobutanol

     

    Chemical test

    Observation

    A

    Add aqueous sodium carbonate

    Effervescence

    B

    Add 2,4-dinitrophenylhydrazine

    White precipitate

    C

    Warm with acidified potassium dichromate

    Colour change from orange to green

    D

    Warm with Tollens' reagent

    Silver mirror

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      61 mark

      The product formed from an analytical test using bromine is shown below.

      246-tribromophenol

      Which chemical was tested for using bromine?

      • Benzoic acid

      • 2,5-Cyclohexadiene-1-ol

      • 4-Hydroxybenzoic acid

      • Phenol

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      71 mark

      Which description of the splitting pattern observed on the 1H NMR spectrum for organic compound is correct?

      ocr-6-9m-q7

      • One doublet and four triplets

      • One triplet, one quartet and one singlet

      • One triplet, one doublet and three singlets

      • One triplet, one quartet and three singlets

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      81 mark

      Which compound is used as a standard in NMR chemical shift measurements?

      • D2O

      • CD3OD

      • DMSO

      • Si(CH3)4 

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      11 mark

      Which statement is correct for the isomers of C6H10O2 below.

      B33oX7Vy_cyclic-c6h10o2-isomers-inc-pyran-based

      • Both isomers produce 4 peaks in their 13C NMR spectrum

      • Both isomers effervesce with the addition of sodium hydrogen carbonate solution

      • One isomer produces a doublet with an integral of 3 in its 1H NMR spectrum

      • One isomer reacts with 2,4-dinitrophenylhydrazine to form an orange precipitate

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      21 mark

      A compound produces the 1H NMR spectrum below.

      q5_21-1_ib_hl_medium_mcq

      Which compound could have produced this spectrum?

      • CH3CH2OCH2CH3

      • CH3CH(OH)CH2CH3

      • CH3COCH2CH3

      • CH3COCH2CH2CH3

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      31 mark

      A compound produces the 13C NMR spectrum below.

      ocr-a2-6-9-q11-2-methyl-3-pentanone-13c-nmr-spectrum

      Which compound could have produced this spectrum?

      • CH3CH2COCH(CH3)2 

      • CH3CH2CH(OH)CH(CH3)2 

      • CH3CH2COCH2CH3 

      • CH3CH2COC(CH3)3 

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      4
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      Which statement(s) is / are true about pentan-3-one?

      1. It will have a triplet and a quartet in its 1H NMR spectrum.

      2. It will create mass spectra peaks at 87 m / z and 57 m / z.

      3. It has a composition of 66.6 % carbon, 22.1 % oxygen and 11.2 % hydrogen.

      • 1, 2 and 3

      • Only 1 and 2

      • Only 2 and 3

      • Only 1

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      51 mark

      The monomer used to make perspex is methyl methacrylate.

       

      7-10-h-q51-aqa-al-chemistry

      The 13C NMR spectrum of methyl methacrylate is show below

       

      7-10-h-q52-aqa-al-chemistry

       

      What is the correct identity of the carbon labelled in peak 3?

      • -C-CH3

      • -COOCH3

      • -O-CH3

      • =C-CH3

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