Identification Of Aldehyde & Ketone Group

At First We have to Identify Aryl Group : 

 We will use Brayde's Reagent to identify the Aryl Group.

Brayde's Reagent is 2,4-Dinitriphinyle Hydrazin. 

So it is also called 2,4-Dinitriphinyle Hydrazin Test.2,4-Dinitriphinyle Hydrazin itself is a yellow solution.

It will react with aryl group ( both Aldehyde & Ketone ) and will 

give 2,4-Dinitriphinyle Hydrazone precipitate.

2,4 Dinitrophenylhydrazine Test