NEETChemistryAldehydes and Ketones
Consider the following statements regarding benzaldehyde and acetophenone: (I) Both benzaldehyde and acetophenone form a red-orange precipitate with 2,4 -DNP reagent. (II) Benzaldehyde reduces Fehling's solution to give a red precipitate of Cu ₂ O . (III) Acetophenone undergoes carbon-carbon bond cleavage on drastic oxidation with chromic acid to form benzoic acid. (IV) Tollens' reagent cannot be used to distinguish
Options
- AOne
- BTwo
- CThree
- DFour
Correct answer
B. Two
Step-by-step solution
Statement (I) is correct: Both benzaldehyde and acetophenone contain a carbonyl group and thus react with 2,4 -DNP reagent to form a red-orange precipitate. Statement (II) is incorrect: Aromatic aldehydes (like benzaldehyde) do not reduce Fehling's solution. Statement (III) is correct: Ketones require drastic conditions for oxidation. Acetophenone undergoes C-C bond cleavage with chromic acid to yield benzoic acid. Statement (IV) is incorrect: Tollens' reagent oxidizes benzaldehyde to produce a silver mirror, but i