NCERT Class XII Chemistry
Chapter - Aldehydes, Ketones and Carboxylic Acids
Questions with Solutions
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Question : 7
Total: 28
Which of the following compounds would undergo aldol condensation, which the Cannizzaro reaction and which neither? Write the structures of the expected products of aldol condensation and Cannizzaro reaction.
(i) Methanal
(ii) 2-Methylpentanal
(iii) Benzaldehyde
(iv) Benzophenone
(v) Cyclohexanone
(vi) 1-Phenylpropanone
(vii) Phenylacetaldehyde
(viii) Butan-1-ol
(ix) 2,2-Dimethylbutanal
(i) Methanal
(ii) 2-Methylpentanal
(iii) Benzaldehyde
(iv) Benzophenone
(v) Cyclohexanone
(vi) 1-Phenylpropanone
(vii) Phenylacetaldehyde
(viii) Butan-1-ol
(ix) 2,2-Dimethylbutanal
Solution:
Aldol condensation is shown by those aldehydes or ketones which have at least one α-H atom while Cannizzaro reaction is undergone by aldehydes that have no α-H atom. Therefore, the given compounds can be classified as:
The aldol reactions undergone are :
| Aldol Condensation | Cannizzaro Condensation | Neither |
|---|---|---|
| 2-Methylpentanal | Methanal | Butan-1-ol |
| Cyclohexanone | Benzaldehyde | Benzophenone |
| 1-Phenylpropanone | 2, 2-Dimelthylbutanal | |
| Phenylacetaldehyde |
Cannizzaro reactions :
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