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Side-chain oxidation of an alkylbenzene or styrene to benzoic acid

This type of question, asked 4 times: 9 May 2023 S2, 16 May 2023 S2, 25 Apr 2025 S2, 13 May 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    9 May 2023 S2

    92
    Identify product 'B' in the following reaction. Cumene →KMnO4,KOH,Δ\xrightarrow{\text{KMnO}_4, \text{KOH}, \Delta} A →H3O+\xrightarrow{\text{H}_3\text{O}^+} B

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  2. Question 2

    16 May 2023 S2

    57
    Identify the product formed in the following reaction: C6H5-CH2-CH3→(i) alk. KMnO4, (ii) H3O+\text{C}_6\text{H}_5\text{-CH}_2\text{-CH}_3 \xrightarrow{\text{(i) alk. KMnO}_4\text{, (ii) H}_3\text{O}^+} product

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  3. Question 3

    25 Apr 2025 S2

    84
    Identify the product formed in the following reaction. C6H5−CH2−CH3→ii) H3O+i) alk. KMnO4C_{6}H_{5}-CH_{2}-CH_{3}\xrightarrow[\text{ii) }H_{3}O^{+}]{\text{i) alk. }KMnO_{4}} Product

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  4. Question 4

    13 May 2026 S2

    20
    Identify the product obtained when phenyl ethene is oxidised using potassium permanganate in dil H2SO4\mathrm{H_2SO_4}.

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