The compound formed when ethanal reacts with a Grignard reagent, followed by acid hydrolysis, is
Correct answer: B. a secondary alcohol
- A. a primary alcohol
- B. a secondary alcohol
- C. a tertiary alcohol
- D. a carboxylic acid
Explanation
The alkyl group of the Grignard reagent adds to the carbonyl carbon, which then carries that new group, the original methyl group, a hydrogen and a hydroxyl, making the product a secondary alcohol. Methanal would give a primary alcohol and a ketone would give a tertiary one. This makes Grignard reagents a general method for building alcohols of any class.
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About Nucleophilic Addition Reactions
Nucleophilic addition occurs at the polar carbonyl group of aldehydes and ketones, where a nucleophile attacks the electron-deficient carbon atom. Reactions with hydrogen cyanide, sodium bisulfite, alcohols and Grignard reagents are explained through tetrahedral intermediates, acid or base catalysis, and the different reactivity of aldehydes and ketones.
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