The reaction of acetone with PCl₅ gives:
Correct answer: A. 2,2-Dichloropropane
- A. 2,2-Dichloropropane
- B. 1,2-Dichloropropane
- C. Propanoyl chloride
- D. Chloroacetone
Explanation
Phosphorus pentachloride (PCl₅) is a reagent that can replace a carbonyl oxygen atom with two chlorine atoms. In this reaction, the oxygen of acetone is replaced by two chlorines on the same carbon, forming the geminal dihalide 2,2-dichloropropane.
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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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