Acetaldehyde in the presence of Conc.H2SO4 undergoes _ ?
Correct answer: B. Polymerization
- A. Dehydration
- B. Polymerization
- C. Aldol Condensation
- D. Oxidation reaction
Explanation
In the presence of concentrated H2SO4, acetaldehyde primarily undergoes polymerization to form paraldehyde. Concentrated sulfuric acid acts as a catalyst for the polymerization process, leading to the formation of a cyclic trimer. Other reactions such as dehydration and oxidation are not the main pathways under these conditions. Aldol condensation is incorrect here because it typically requires basic conditions rather than the acidic environment provided by concentrated sulfuric acid.
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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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