Grignard reagent gives carboxylic acid with____________?
Correct answer: A. CO2
- A. CO2
- B. CH3CHO
- C. COC2
- D. HCN
Explanation
A Grignard reagent reacts with carbon dioxide to form a magnesium carboxylate, which gives a carboxylic acid after acidic hydrolysis: RMgX + CO2, followed by H3O+, gives RCOOH. Acetaldehyde would instead produce an alcohol, so students may choose b by remembering that Grignard reagents add to carbonyl compounds without considering the product type.
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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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550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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