Halogen compounds: past paper questions

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• Question 8Oct/Nov 2025, paper 41Structured13 marksHas a diagram

  In the electrophilic substitution of arenes, different substituents can direct to different ring positions. Describe the directing effect of the $-{\text{NO}}_2$ group.

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• Question 7Oct/Nov 2024, paper 42Structured11 marksHas a diagram

  Benzene reacts with chlorine gas to form chlorobenzene. This reaction can be described as the reaction between benzene molecules and ${\text{Cl}}^{+}$ ions. The ${\text{Cl}}^{+}$ ions are formed by adding a suitable catalyst to the chlorine gas.

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• Question 9Oct/Nov 2023, paper 41Structured13 marksHas a diagram

  Benzoyl chloride, ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\mathrm{O}\mathrm{C}\mathrm{l}$, can be made from ethyl benzene in a two-step process. A reaction scheme is shown. Draw the intermediate organic compound $\mathbf{M}$ in the box.

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• Question 8May/June 2025, paper 41Structured11 marksHas a diagram

  Bromine reacts with methylbenzene in the dark in the presence of a suitable catalyst to form $\mathrm{H}\mathrm{B}\mathrm{r}$ and compound L, ${\mathrm{C}}_7{\mathrm{H}}_7\mathrm{B}\mathrm{r}$. L is one of three isomers that can form in this reaction.

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• Question 8May/June 2023, paper 42Structured15 marksHas a diagram

  Describe the difference in reactivity between chloroethane and chlorobenzene with ${\text{OH}}^{-}\text{(aq)}$.

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