Compound Q is a reducing carbonyl compound, but tests conflict with choices Steps:

• Red precipitate with 2,4-dinitrophenylhydrazine indicates a carbonyl group (aldehyde or ketone), eliminating alcohols A and B.
• Orange precipitate with Fehling's reagent indicates a reducing aldehyde, fitting C (propanal) but not D (propanone, a non-reducing ketone).
• Yellow precipitate with alkaline aqueous iodine indicates iodoform test, positive for methyl ketones (D) or acetaldehyde/ethanol (A), but negative for propanal (C). Not enough information to identify Q uniquely, as no choice matches all three tests.

Final answer: Not enough information.