Which one of the following molecules does not form alcohol when reacts with Grignard reagent ?
Correct answer: D. carbondioxide
- A. formaldehyde
- B. acetaldehyde
- C. propanone
- D. carbondioxide
Explanation
Formaldehyde and aldehydes or ketones react with Grignard reagents to form alcohols after hydrolysis, but CO2 gives a magnesium carboxylate and then a carboxylic acid. Therefore carbon dioxide does not produce an alcohol in this reaction. Students may choose propanone because ketones give tertiary alcohols, but they do still form alcohols with Grignard reagents.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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