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JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

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Given below are two statements:

Statement I: Acidity of -hydrogens of aldehydes and ketones is responsible for Aldol reaction.

Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of above statements, choose the most appropriate answer from the options given below.
  1. (A)Both Statement I and Statement II are correct.
  2. (B)Both Statement I and Statement II are incorrect.
  3. (C)Statement I is incorrect but Statement II is correct.
  4. (D)Statement I is correct but Statement II is incorrect.✓ Correct

Answer: (D)

Solution

Statement I: The -hydrogens of aldehydes/ketones are acidic; their removal by base gives the enolate that initiates the Aldol reaction — correct.

Statement II: Benzaldehyde has no -hydrogen, but ethanal does. Their mixture undergoes a cross-aldol condensation (ethanal enolate adds to benzaldehyde, giving cinnamaldehyde). So the claim that no cross-aldol product forms is incorrect.

Statement I correct, Statement II incorrect option D.

JEE Main · 2024 · 04 Apr 2024 · Shift 1 · Single correct option

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