In which of the following compounds, carbon number is decreased duringthe oxidation:
Correct answer: B. Ketone
- A. Aldehyde
- B. Ketone
- C. Alcohol
- D. Ether
Explanation
In Ketone carbon atom decreased because a carboxylic acid is also formed when Oxidation occurOxidation of Ketones:Ketones do not undergo oxidation easily because they require breaking of strong carbon - carbon bond. They give no reaction with mild oxidising agents. They are only oxidised by strong oxidising agents such as K2Cr2O7/ H2SO4 , KMnO4/ H2SO4, and conc. HNO3. In oxidation of ketones, only the carbon atoms adjacent to the carbonyl group are attacked. The carbon atom joined to the smaller number of hydrogen atoms is preferentially oxidised. In case of symmetrical ketones only one carbon atom adjacent to the carbony group is oxidised and a mixture of two carboxylic acids is always obtained. However, in case of unsymmetrical ketones, the carbon atom joined to the smaller number of hydrogen atoms is preferentially oxidised and the carbonyl group remains with the smaller alkyl group.
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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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