Mass spectrometry in organic analysis

Mass spectrometry in organic analysis Quiz

Spec 7A · Edexcel A-Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. A compound's mass spectrum has its highest m/z peak at 72. What is its relative molecular mass?

    • A. 36
    • B. 71
    • C. 72
    • D. 73

  2. 2. A fragment peak is 29 below the molecular ion. Which group has been lost?

    • A. CH₃
    • B. C₂H₅ (or CHO)
    • C. OH
    • D. H₂O

  3. 3. Which ion produces a peak at m/z 45 in the spectrum of propan-2-ol?

    • A. [CH₂OH]⁺
    • B. [CH₃CHOH]⁺
    • C. [CH₃]⁺
    • D. [C₃H₇]⁺

  4. 4. Why are uncharged radicals not seen in the spectrum?

    • A. They are too heavy
    • B. They are not accelerated or detected as they carry no charge
    • C. They recombine immediately
    • D. They have the same m/z as the molecular ion

  5. 5. A compound has Mr 58, with fragments at m/z 43 and 15 only. Which is it?

    • A. Propanal
    • B. Butane
    • C. Propanone
    • D. Propan-2-ol

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