Tollen’s reagent – A solution of AgNO3 dissolved in NH4OH is known as Tollen’s reagent. This is used to detect the presence of –CHO group in an organic compound.
It is used to distinguish between aldehydes and ketone.
Fehling solution- Fehling’s test consists of a solution that is usually prepared fresh in laboratories. Initially, the solution exists in the form of two separate solutions which are labelled as Fehling’s A and Fehling’s B. Fehling’s A is a solution containing copper(II) sulphate, which is blue in colour. Fehling’s B is a clear liquid consisting of potassium sodium tartrate (Rochelle salt) and a strong alkali, usually sodium hydroxide. During the test solutions A and B are prepared individually and stored.
It is used to determine whether a carbonyl group is an aldehyde or a ketone.
Lucas reagent- Lucas reagent is a solution of anhydrous zinc chloride (Lewis acid) in concentrated hydrochloric acid.
It is used as a reagent to test alcohols and classify them in accordance to their reactivity.
