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.
Last updated
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.
Practise Carboxylic Acids
550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1 mole of X, where X is an organic compound requires 0.5 moles of oxygen to produce carboxylic acid, the compound may be
A compound is oxidized to X, by further oxidation of X if resulting compound is butyric acid, starting compound can be:
Acetic acid is called _ acid.
Acetic acid was first isolated from:
By treating CO2 with Grignard's reagent, the following compound is obtained;