Aldehyde (Organic Salt Analysis)

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AIM – To test the presence of aldehyde in the given organic compound.

Preliminary Test:-

Experiment Observation Inference
Added bromine water to solution No Effect Compound is saturated.
Or Or
Pink colour of Bromine water changed to colourless. Compound is unsaturated.
Added drop of blue Litmus to solution. No Effect. Carboxylic Acid and Phenol absent.
Added a few drops 2,4-dinitrophenylhydrazine to the solution. Yellowish -orange precipitate formed. Aldehyde or ketone may be present.

Confirmatory Test:-

Experiment Observation Inference
Added a few drops of Fehling’s solution A & B. Formation Of red colour. Aldehyde confirmed.

Chemical Equations:-

R3C-CR3 + Br2 –> No Effect


R2C=CR2 + Br2  –>  BrR2C-CR2Br

R-CHO + (NO2)2C6H3NHNH2 –>  (NO2)2C6H3NHN=CRH (Yellowish Orange) + H2O

RCHO + 2Cu2+ + 2H2O –> RCOOH + Cu2O(Red) + 4H+

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