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CBSE - XII Science - Chemistry - Aldehydes, Ketones and Carboxylic Acids

what are the aldol condensation reactions and canizaros reaction?

Asked by Gundeep Singh 7th January 2012, 4:34 PM
Answered by Expert


Aldol Reaction:  This reaction takes place between two molecules of carbonyl compounds; one molecule should have at least two a-hydrogen atoms. In this reaction best result is obtained when


Both molecule are the same or one should have no ?-hydrogen atom and other should have at least two ?-hydrogens.


The reaction is two step reaction. First step is aldol formation and second step is dehydration of aldol.

Cannizzaro reaction  

 It involves a reaction with aldehydes which have no alpha hydrogen atoms. It is a disproportionate reaction. 
2C6 H5 CHO ?C6H5 CHOH + C6 H5 COOK
Benzaldehyd                          Benzl alcohol        Potassium benzoate
Answered by Expert 8th January 2012, 12:38 PM

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