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AS & A Level · AS/A Level

Chemistry

Organic mechanisms and synthesis

Name: ____________________Date: October 10, 2026
  1. 1.

    Describe a test distinguishing ethene from ethane at room temperature without ultraviolet light, and state the observation for each.

    [3 marks] · no calculator
  2. 2.

    State a reagent and condition for converting bromoethane into ethanol, and name the reaction type.

    [3 marks] · no calculator
  3. 3.

    Explain electrophilic addition of HBr to ethene, identifying the electron source, intermediate and final attacking species.

    [3 marks] · no calculator
  4. 4.

    Plan conversion of propan-1-ol to propanoic acid. Specify reagent and heating arrangement, and explain why distillation during oxidation would be unsuitable.

    [3 marks] · no calculator
  5. 5.

    A tertiary halogenoalkane hydrolyses through a carbocation; a primary analogue reacts in one concerted step. Compare how doubling hydroxide concentration affects each rate, under the simple SN1 and SN2 models.

    [4 marks] · no calculator
  6. 6.

    An ester is prepared from ethanol and ethanoic acid using an acid catalyst. Explain reflux, why conversion is incomplete, and how removing a product differs from adding more catalyst.

    [4 marks] · no calculator

Original, unofficial practice questions from SubjectScout — not official past-paper questions.

Marking points are indicative, not an official mark scheme. Accept equivalent valid methods and supported interpretations that address the task; award each mark once without requiring the model wording.