Engineering
Chemistry
Chemical Reaction of Aldehyde and Ketones
Question
Give number of compounds which will oxidise during cross cannizaro reaction with
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Solution
Cross Cannizzaro reaction involves aldehydes without alpha-hydrogens reacting with formaldehyde. Formaldehyde is oxidized to formic acid, while the other aldehyde is reduced to alcohol. Among the given compounds, only aldehydes without alpha-hydrogens can be oxidized by formaldehyde. The compounds are:
- Benzaldehyde (no alpha-H) - oxidizes
- Formaldehyde (no alpha-H) - but it self-oxidizes/reduces, not in cross with itself
- Acetaldehyde (has alpha-H) - does not undergo Cannizzaro
- Trimethylacetaldehyde (no alpha-H) - oxidizes
- Acetone (ketone, has alpha-H) - does not undergo
- p-Nitrobenzaldehyde (no alpha-H) - oxidizes
Thus, compounds 1, 4, and 6 will oxidize.
Final Answer: 3