Which of the following reagents are used to ditinguish aldehydes from Ketones ?
I) Fehling’s reagent 
II) Lucas reagent
III) Hinsberg’s reagent 
IV) Tollens reagent

The Tollens' test is a reaction that is used to distinguish aldehydes from ketones, as aldehydes are able to be oxidized into a carboxylic acid while ketones cannot. Tollens' reagent, which is a mixture of silver nitrate and ammonia, oxidizes the aldehyde to a carboxylic acid.

Fehling's solution is used to distinguish between aldehyde and ketone functional groups. Aldehydes oxidize to give a positive result but ketones won't react to the test (except for α-hydroxy ketones).

 Lucas reagent is used to distinguish 1^o,2^o and 3^o alcohols.

Hinsberg’s reagent is used to distinguish 1^o,2^o and 3^o amines.