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difference between cannizzaro’s reaction and aldol condensation

difference between cannizzaro’s reaction and aldol condensation
 

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1 Answers

Aarti Gupta
askIITians Faculty 300 Points
6 years ago
The difference between Canninzaro’s and Aldol condensation lies in the presence or absence of \alpha(alpha)-hydrogen.
Aldol-Condensation -
Aldehydes and ketones which contains at least one alpha-hydrogen undergo self-condensation in the presence of dil.alkali and form beta-hydroxy aldehyde known as aldol or beta-hydroxy ketone called as ketol respectively.
CH3CHO + CH3CHO -----------> CH3CHOHCH2CHO
If this alpha hydrogen is absent in aldehyde or ketone like formaldehyde,benzaldehyde or benzophenone,aldol condensation is not possible.
Canninzaro’s Reaction
This reaction is given by aldehyde which do not contain alpha-hydrogen.Aldehydes like formaldehyde or benzaldehyde undergo self-oxidation and reduction on treating with conc.alkali.(KOH).One molecule is oxidised to acid and another is reduced to alcohol.
HCHO + HCHO ----------> CH3OH + HCOOK

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