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NEETChemistryAldehydes and Ketones

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): An unknown compound ( C ₈ H ₈ O ) that forms a 2,4-DNP derivative but fails to reduce Fehling's solution must definitively be a ketone. Reason (R): Aromatic aldehydes do not reduce Fehling's solution. In the light of the above statements, choose the most appropriate answer from the options given be

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

D. Assertion (A) is false but Reason (R) is true

Step-by-step solution

Assertion (A) states that a compound with formula C ₈ H ₈ O giving a positive 2,4-DNP test but a negative Fehling's test must definitively be a ketone. While ketones do give a positive 2,4-DNP test and a negative Fehling's test, aromatic aldehydes also exhibit the exact same behavior. For the formula C ₈ H ₈ O , the compound could be a ketone like acetophenone ( C ₆ H ₅ COCH ₃ ) or an aromatic aldehyde like o-, m-, or p-tolualdehyde ( CH ₃ C ₆ H ₄ CHO ). Therefore, it cannot be definitively concluded that the compo

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