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Aldehydes, Ketones and Carboxylic Acids
Preparation of Carboxylic Acids from Grignard Reagents
1 question from 1 paper, each with its answer.
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Concepts tested
- Carboxylation of Grignard reagent
All Questions
2002 AIPMT 1 question
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In the above reaction product 'P' is : -A Grignard reagent adds to carbon dioxide (dry ice); the carbanion-like carbon attacks the carbon of $CO_2$:
$C_6H_5MgBr + CO_2 \rightarrow C_6H_5COOMgBr$
Acid hydrolysis gives the carboxylic acid:
$C_6H_5COOMgBr + H_3O^+ \rightarrow C_6H_5COOH + Mg(OH)Br$
The acid formed has one carbon more than the Grignard reagent.
So P is benzoic acid, $C_6H_5COOH$.