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Phthalein dye test for phenols

This type of question, asked 4 times: 2021 Paper 1, 2021 Paper 19, 8 Apr 2023, 27 Jan 2024. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 1

    46
    Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H2SO4H_{2}SO_{4} followed by treatment with NaOHNaOH?

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  2. Question 2

    2021 Paper 19

    31
    Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4H_{2}SO_{4} ?

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  3. Question 3

    8 Apr 2023

    140
    A compound ' XX ' when treated with phthalic anhydride in presence of concentrated H2SO4H_{2}SO_{4} yields ' YY '. ' YY ' is used as an acid/base indicator. ' XX ' and ' YY ' are respectively:

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  4. Question 4

    27 Jan 2024

    126
    Phenolic group can be identified by a positive:

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