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CBSE Class 12-science Answered

what are the aldol condensation reactions and canizaros reaction?
Asked by Gundeep Singh | 07 Jan, 2012, 04:34: PM
Expert Answer

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. 
                       KOH
2C6 H5 CHO ————?C6H5 CH2 OH + C6 H5 COOK
Benzaldehyd                          Benzl alcohol        Potassium benzoate
 
 
Answered by | 08 Jan, 2012, 12:38: PM
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