Question
Download Solution PDFWhich among the following compounds will give Cannizzaro reaction ?
(i) C6H5-CHO
(ii)
(iii) l3C-CHO
(iv) HCHO
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The Cannizzaro reaction is a redox reaction where an aldehyde without an alpha hydrogen undergoes disproportionation in the presence of a strong base.
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Only aldehydes that lack alpha hydrogen atoms will participate in the Cannizzaro reaction.
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The reaction produces a primary alcohol and a carboxylic acid or their respective salts.
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Explanation:
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C6H5-CHO (Benzaldehyde): Lacks alpha hydrogens due to the benzene ring attached to the carbonyl carbon.
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(CH3)3C-CHO (Pivaldehyde or Trimethylacetaldehyde): No alpha hydrogens as the carbonyl carbon is bonded to three methyl groups.
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l3C-CHO (Triiodoacetaldehyde): No alpha hydrogens since the carbonyl carbon is bonded to three iodine atoms.
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HCHO (Formaldehyde): No alpha carbons and, therefore, no alpha hydrogens.
Conclusion:
All the given compounds can undergo the Cannizzaro reaction because they lack alpha hydrogen atoms. This reaction results in the formation of an alcohol and a carboxylic acid in the presence of a strong base.
Thus, the correct answer is: (i), (ii), (iii) and (iv)
Last updated on Jun 18, 2025
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