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Colour tests for carbohydrates (Seliwanoff, Barfoed, Benedict)

This type of question, asked 5 times: 2021 Paper 16, 2021 Paper 21, 2021 Paper 26, 27 Jul 2022, 30 Jan 2023. All 5 questions below, oldest first.

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  1. Question 1

    2021 Paper 16

    38
    How to differentiate between monosaccharides and disaccharides

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  2. Question 2

    2021 Paper 21

    46
    Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?

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  3. Question 3

    2021 Paper 26

    50
    Seliwanoff test and Xanthoproteic test are used for the identification of respectively

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  4. Question 4

    27 Jul 2022

    47
    A sugar ' XX ' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar ' XX ' is

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  5. Question 5

    30 Jan 2023

    44
    Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ketoses give Seliwanoff's test faster than Aldoses. Reason (R): Ketoses undergo β\beta-elimination followed by formation of furfural. In the light of the above statements, choose the correct answer from the options given below:

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