Which of the following reagents can be used to differentiate an aldose from a ketose?

Step-by-step solution

Bromine water is a mild oxidizing agent. It selectively oxidizes the aldehyde group of an aldose to a carboxylic acid, forming an aldonic acid, and in the process, the reddish-brown colour of bromine water is discharged. Ketoses do not have an oxidizable aldehyde group and are not oxidized by mild oxidizing agents like bromine water. Hence, they do not decolorize bromine water. Tollens' reagent cannot be used to differentiate them because, in the alkaline medium of Tollens' reagent, ketoses undergo Lobry de Bruyn-v