Q.

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:                        [2026]

Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the following reaction:

1 2, 4-DNP reagent  
2 Saturated NaHSO3 solution  
3 Fehling solution  
4 Lucas reagent  

Ans.

(3)