Carboxylic acids can be prepared by the reactions of the Grignard reagent with:
Correct answer: B. Carbon dioxide
- A. Nitrogen
- B. Carbon dioxide
- C. Formaldehyde
Explanation
Carboxylic acids can be prepared by reacting Grignard reagents (RMgX, where R is an alkyl or aryl group and X is a halogen) with carbon dioxide (CO2) in a process called the Grignard reaction with CO2: RMgX + CO2 -> RCOOMgX RCOOMgX + H2O -> RCOOH + Mg(OH)X
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About Nomenclature, Structure and Preparation
Carboxylic acids are prepared by oxidising primary alcohols or aldehydes, hydrolysing nitriles, esters and amides, and carbonating suitable organometallic compounds. Their structures, IUPAC naming, resonance stabilisation and acidic character explain why carboxylic acids differ from alcohols and phenols, despite all containing oxygen and hydrogen.
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