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Aldol condensation product, or the reactants for a given product

This type of question, asked 5 times: 3 May 2023 S1, 12 May 2024 S1, 20 Apr 2025 S2, 11 Apr 2026 S2, 15 May 2026 S2. All 5 questions below, oldest first.

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  1. Question 1

    3 May 2023 S1

    65
    Identify the product 'B' in the following sequence of reactions. Propanone →Ba(OH)2A→Δ,−H2OB\xrightarrow{\text{Ba(OH)}_2} A \xrightarrow{\Delta,-\text{H}_2\text{O}} B

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  2. Question 2

    12 May 2024 S1

    74
    Identify product B in following sequence of reactions: 2n2n Propanone →Ba(OH)2\xrightarrow{\text{Ba(OH)}_2} A →Δ,−H2O\xrightarrow{\Delta, -\text{H}_2\text{O}} nn B

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  3. Question 3

    20 Apr 2025 S2

    80
    Identify the product ' B ' in following reaction. Ethanal → dil NaOHA→H2OΔB\xrightarrow{\text{~dil~}NaOH}A\xrightarrow[H_{2}O]{\mathrm{\Delta}}B

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  4. Question 4

    11 Apr 2026 S2

    44
    When ethanal and propanal undergo aldol condensation with dilute NaOH, the pair of products obtained by cross condensation reaction is

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  5. Question 5

    15 May 2026 S2

    42
    Which of the following compounds forms 44-Methylpent-33-en-22-one by aldol condensation on further dehydration.

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