Chemistry - Carbonyl compounds Question with Solution | TestHub
Compound P () gives a red orange precipitate with -DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. . Compounds P and Q, respectively, are :
NEET 2026 (Cancelled)
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Answer:
Solution:
Compound P () gives a red-orange precipitate with -DNP reagent, indicating the presence of a carbonyl group.
P does not reduce Fehling's reagent, which implies it is either a ketone or an aromatic aldehyde.
The requirement of "drastic oxidation" strongly suggests that P is a ketone. Ketones resist mild oxidation and require drastic conditions (such as chromic acid) to undergo C-C bond cleavage, whereas aldehydes are easily oxidized.
Acetophenone () is a ketone that fits the molecular formula .
Drastic oxidation of acetophenone with chromic acid cleaves the methyl group to yield benzoic acid (), which is compound Q.
Benzoic acid is an aromatic carboxylic acid that reacts with aqueous to produce effervescence of gas.
Therefore, P is acetophenone and Q is benzoic acid.
Answer: 4
