Which pair can be used as a reactant for the preparation of acetyl chloride:
Correct answer: D. Both "B" and "C"
- A. CH3COOH, HCI
- B. CH3COOH, PCI5
- C. CH3COOH, SOCI2
- D. Both "B" and "C"
Explanation
The addition of a nucleophile to the carboxyl group is always followed by the displacement of the OH group by some other group, producing a carboxylic acid derivative. The OH group can thus be replaced by X, OR and NH2 to form halides, esters and amides,respectively. Reactions with PCI5 and SOCI2: (a) CH3COOH + PCl5 →CH3COCl + POCl3+HCl (b) CH3COOH + SOCl2 →CH3COCl + SO2 + HCl (c) 3CH3COOH + PCI3 --->3CH3COCI+H3PO3
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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