A substance that gives positive iodoform test will most probably not give which reaction
Correct answer: D. Cannizaro's reaction
- A. Addition of HCN
- B. Addition of NaHSO3
- C. Aldol condensation
- D. Cannizaro's reaction
Explanation
Idoform test needs α - H.The Cannizzaro reaction is a disproportionation reaction that occurs in aldehydes with no alpha hydrogens. In this reaction, one molecule of the aldehyde is reduced to an alcohol, while another molecule is oxidized to a carboxylic acid. However, for a substance to give a positive iodoform test, it needs to have a methyl ketone functional group (CH3-CO-). This means it must have at least one alpha hydrogen atom attached to the carbonyl carbon. Since the Cannizzaro reaction requires aldehydes without alpha hydrogens, a substance that gives a positive iodoform test will most probably not undergo the Cannizzaro reaction.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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