Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone ?
Correct answer: C. tertiary alcohol
- A. primary alcohol
- B. secondary alcohol
- C. tertiary alcohol
- D. dihydric alcohol
Explanation
Ethyl magnesium bromide adds an ethyl group to acetone, converting the carbonyl carbon into a carbon bonded to three carbon groups and an -OH group after hydrolysis. This structure is a tertiary alcohol. Students may choose secondary alcohol because Grignard addition to an aldehyde other than formaldehyde gives a secondary alcohol, whereas acetone is a ketone.
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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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