Preparing amines and diazonium dyes

Preparing amines and diazonium dyes Quiz

Spec 19.4–6 · Edexcel International A Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Which reagent reduces a nitrile such as CH₃CH₂CN to a primary amine?

    • A. LiAlH₄ in dry ether
    • B. NaOH(aq) under reflux
    • C. Dilute HCl under reflux
    • D. Ethanolic KCN

  2. 2. What are the reagents and conditions for reducing nitrobenzene to phenylamine?

    • A. NaNO₂ and HCl below 10 °C
    • B. Tin and concentrated HCl, heated under reflux
    • C. Excess ethanolic ammonia in a sealed tube
    • D. KCN in ethanol, heated under reflux

  3. 3. Why must a benzenediazonium chloride solution be kept below 10 °C?

    • A. The dye is insoluble in warm water
    • B. Phenol freezes at higher temperatures
    • C. Nitrous acid is a gas above 10 °C
    • D. The diazonium ion decomposes to phenol and nitrogen

  4. 4. In which conditions does a diazonium ion couple with phenol?

    • A. In alkaline solution, where phenol exists as the phenoxide ion
    • B. In concentrated acid
    • C. In dry ether
    • D. In hot ethanol

  5. 5. Why is an azo dye coloured?

    • A. The azo group is an ionic bond
    • B. Its delocalised system absorbs ultraviolet only
    • C. The delocalisation extends over both rings and N=N, so visible light is absorbed
    • D. It contains nitrogen gas

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