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MCQEasyJEE 2025Aldehydes & Ketones

JEE Chemistry 2025 Question with Solution

The compounds which give positive Fehling's test are:

A set of organic compounds labeled A to E, including aromatic and carbonyl-containing structures, for identifying which give positive Fehling's test.

Choose the CORRECT answer from the options given below:

  • A

    (A), (C) and (D) Only

  • B

    (A), (D) and (E) Only

  • C

    (C), (D) and (E) Only

  • D

    (A), (B) and (C) Only

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: The compounds are to be checked for a positive Fehling's test.

Find: Which set of compounds gives a positive Fehling's test.

Fehling's test is used to distinguish aldehydes from most ketones. Aldehydes give a positive test, while most ketones do not. However, α\alpha-hydroxy ketones also give a positive test.

From the solution, the compounds (C), (D) and (E) are identified as giving a positive Fehling's test. Compounds (C) and (D) are stated to behave as aldehydes, and (E) is stated to be an aldehyde or capable of tautomerizing to an aldehyde.

Therefore, the correct option is C, that is (C), (D) and (E) Only.

Common mistakes

  • Assuming that only aldehydes give a positive Fehling's test is incomplete. Some α\alpha-hydroxy ketones can also respond positively. Check for exceptional ketones before rejecting an option.

  • Confusing Fehling's test with tests for aromatic aldehydes or general carbonyl compounds can lead to the wrong choice. Focus specifically on whether the compound can behave as a reducing aldehyde under the test conditions.

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