International A Level (IAL)ChemistryEdexcelExam Questions2. Energetics, Group Chemistry, Halogenoalkanes & AlcoholsOrganic Chemistry: Techniques & Spectra

Organic Chemistry: Techniques & Spectra (Edexcel International A Level (IAL) Chemistry): Exam Questions

Exam code: YCH11

1 hour12 questions

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Organic Chemistry: Techniques & Spectra

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1
1 mark

The infrared spectrum of an organic compound is shown.

q1-paper-2-oct-2021-edexcel-ial-chemistry

Which of these compounds would give this infrared spectrum?

  • hexanal

  • hexane

  • hexanoic acid

  • hexan-1-ol

Choose your answer

2
1 mark

In a mass spectrum, the molecular ion is the ion which always has the

  • greatest abundance

  • greatest stability

  • highest charge

  • highest mass/charge ratio

Choose your answer

3
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1 mark

Butan-1-ol and butan-2-ol are isomers.

Which m / z value would be expected to have a significant peak in the mass spectrum of butan-1-ol but not that of butan-2-ol?

  • 15

  • 29

  • 43

  • 57

Choose your answer

4
1 mark

Which could be the infrared spectrum of CH2=CHCH2OH?

q12-1-paper-2-june-2021-edexcel-ial-chemistry
q12-2-paper-2-june-2021-edexcel-ial-chemistry

    Choose your answer

    5
    1 mark

    An aliphatic organic compound has the infrared spectrum shown.

    q14-paper-5-june-2021-edexcel-ial-chemistry

    What are the bond stretches responsible for the peaks P and Q in the spectrum?

     

     

    P

    Q

    □

    A

    O—H carboxylic acid

    C═O carboxylic acid

    □

    B

    O—H carboxylic acid

    C═O aldehyde

    □

    C

    C—H aldehyde

    C═O carboxylic acid

    □

    D

    C—H aldehyde

    C═O aldehyde

      Choose your answer

      1
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      1 mark

      The infrared spectrum of a compound X is shown.

      q5-paper-5-jan-2022-edexcel-ial-chemistry

      Which could be compound X?

      q5-2-paper-5-jan-2022-edexcel-ial-chemistry

        Choose your answer

        2
        1 mark

        The mass spectrum of propanone is shown.

        q13-paper-2-june-2021-edexcel-ial-chemistry

        Which fragment is most likely to produce the peak at m / z = 43?

        • CH3CH2Cstraight H subscript 2 superscript plus

        • CH3CO+

        • CH2CHO+

        • CHCH2O+

        Choose your answer

        3
        1 mark

        Which reagent produces a silver mirror when warmed with propanal but not when warmed with propanone?

        • 2,4-dinitrophenylhydrazine (Brady's reagent)

        • Acidified potassium dichromate(VI)

        • Fehling's solution

        • Tollens' reagent

        Choose your answer

        1a
        1 mark

        A colourless liquid, Z, is known to be either ethanol (CH3CH2OH) or methoxymethane (CH3OCH3).

        The mass spectrum and infrared spectrum of Z are shown.

        Mass spectrum graph showing relative intensity versus m/z (mass-to-charge) ratio. Peaks at m/z 30, 40, 45, highest at 30.
        IR spectrum of ethanol

        What is the relative molecular mass, Mr, of compound Z?

        • 30

        • 44

        • 46

        • 60

        Choose your answer

        1b
        1 mark

        The broad IR absorption in the range 3230–3550 cm–1 is characteristic of which bond?

        • C=C

        • C=O

        • C–H

        • O–H (alcohol)

        Choose your answer

        1c
        1 mark

        What is the identity of compound Z?

        • Ethanol, because the IR shows a broad peak at 3200–3550 cm–1

        • Ethanol, because the IR shows no peak near 1715 cm–1

        • Methoxymethane, because both compounds have Mr = 46

        • Methoxymethane, because methoxymethane contains an O–H bond

        Choose your answer