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Testing for aldehydes and Ketones 

Tollens Reagent - Colourless solution of silver nitrate dissolved in aqueous ammonia.

Heated with aldehyde = Silver mirror is formed

Aldehyde is OXIDISED to produce a carboxyllic acid

Heated with Ketone = No reaction

Fehlings Solution

Blue solution of Cu 2+ ions dissolved in NaOH.

Heated with aldehyde = Brick red precipitate is formed 

Heated with Ketone = No reaction

Reducing aldehydes and Ketones = Nucleophilic addition

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