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NEET-UG Biology

Detection of functional groups — practice questions

4 questions in the bank on this idea. Below are 4 of them, exactly as they appear in a test.

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  1. Question 1 · difficulty L1 · recall

    Which observation is expected when a carboxylic acid is treated with aqueous sodium hydrogen carbonate?

    • A. Effervescence due to carbon dioxide
    • B. A silver mirror on the test tube
    • C. A violet colour with neutral ferric chloride
    • D. A brick-red precipitate without heating

  2. Question 2 · difficulty L2 · understanding

    Neutral ferric chloride is commonly used to detect which functional class by a characteristic coloured complex?

    • A. Alkanes
    • B. Phenols
    • C. Ethers
    • D. Haloalkanes

  3. Question 3 · difficulty L2 · understanding

    Two colourless liquids both react with 2,4-DNP. Only liquid X gives a silver mirror with Tollens' reagent. What distinguishes X from the other liquid?

    • A. X is a carboxylic acid whereas the other liquid is an ester
    • B. X is a ketone whereas the other liquid is an aldehyde
    • C. X is an alcohol whereas the other liquid is an ether
    • D. X is an aldehyde whereas the other liquid is a ketone

  4. Question 4 · difficulty L3 · application

    A compound gives an orange precipitate with 2,4-dinitrophenylhydrazine but does not give Tollens' test. Which class best fits the observations?

    • A. Carboxylic acid
    • B. Primary alcohol
    • C. Ketone
    • D. Alkane

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