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(8) e:-20 - Explain self oxidation - reduction of aldehydes having no alpha - hydrogen atom. Explain the process of saponification with suitable example
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Write a note on self oxidation-reduction reaction of aldehyde with suitable example.

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Self oxidation reduction reaction of aldehyde : Aldehydes which have no alpha (α) hydrogen (e.g. formaldehyde, trimethylacetaldehyde, benzaldehyde etc.) undergo base induced disproportionation reaction to form equal amounts of corresponding alcohol and carboxylic acid. This reaction is known as cannizzaro reaction,

Benzaldehyde

2C

6

H

5

CHO+KOH

→

Benzyl alcohol

C

6

H

5

CH

2

OH

+

Potassium benzoate

C

6

H

5

CO

2

K

+

Here, one mole benzaldehyde reduced to benzyl alcohol and one mole benzaldehyde oxidised to potassium salt of benzoic acid.

Explanation:

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