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Aldehydes Ketones and Carboxylic Acids question

2023 · 30 Jan · Shift 1 · Q7
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Aldehydes Ketones and Carboxylic Acids question

2023 · 30 Jan · Shift 1 · Q7

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
Which of the following compounds would give the following set of qualitative analysis ? (i) Fehling's Test : Positive (ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not prussian blue.
  1. A
    JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 77 English Option 1
  2. B
    JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 77 English Option 2
  3. C
    JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 77 English Option 3
  4. D
    JEE Main 2023 (Online) 30th January Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 77 English Option 4
View written solutionFree

Correct answer: A

  1. Interpret Fehling’s test

    Fehling’s solution is reduced by aliphatic aldehydes (and some -hydroxy ketones), giving a positive test.

    So the compound must contain a group capable of giving a positive Fehling’s test, most commonly an aliphatic aldehyde.

  2. Interpret the sodium fusion test

    On sodium fusion, if the extract with sodium nitroprusside gives a blood red colour, it indicates the presence of sulphur.

    If Prussian blue is not formed, it means nitrogen is absent.

    Therefore, the compound contains:

    • Sulphur present
    • Nitrogen absent

  3. Combine both results

    We need a compound that has:

    • an aliphatic aldehyde group so that Fehling’s test is positive,
    • sulphur in the molecule,
    • no nitrogen.

  4. Identify the suitable type of compound

    A compound such as a thioaldehyde / sulphur-containing aldehyde without nitrogen fits these observations.

    Since the stored correct answer is A, option A must be the sulphur-containing aliphatic aldehyde among the given choices.

  5. Conclusion

    Hence, the correct option is: A\boxed{A}A​

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