Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Describe Cannizzaro Reaction and Write a note on Cannizzaro reaction. - Chemistry

Short Note

Describe Cannizzaro reaction

Write a note on Cannizzaro reaction.

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Solution

  1. This reaction is given only by aldehydes having no α-hydrogen atom.
  2. Aldehydes undergo self -oxidation and reduction reaction on heating with concentrated alkali.
  3. In Cannizzaro reaction, one molecule of an aldehyde is reduced to alcohol and at the same time the second molecule is oxidized to carboxylic acid salt. Thus, the reaction is an example of disproportionation reaction.

e.g. 1. \[\begin{array}{cc}
\ce{O\phantom{.................................}}\ce{O\phantom{..................}}\ce{H\phantom{}}\\
||\phantom{.................................}||\phantom{...................}|\\
\ce{\underset{\text{Formaldehyde}}{2H - C - H} + \underset{\text{Sodium hydroxide (50%)}}{NaOH} ->[\triangle] \underset{\text{Sodium formate}}{H - C - O- Na+} + H - C - OH}\\\phantom{......................................................}|\\\ce{\phantom{......................................................}\underset{\text{Methanol}}{H}}\end{array}\]

2.

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APPEARS IN

Balbharati Chemistry 12th Standard HSC Maharashtra State Board
Chapter 12 Aldehydes, Ketones and Carboxylic acids
Exercise | Q 4.1 | Page 281
NCERT Class 12 Chemistry Textbook
Chapter 12 Aldehydes, Ketones and Carboxylic Acids
Q 16.2 | Page 378
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