Ethanal reacts with CH3CH2Mg Br the product formed is:
Correct answer: C. CH3CH(OH)CH2CH3
- A. CH3CH2OH
- B. CH3CH2CHO
- C. CH3CH(OH)CH2CH3
- D. CH3CH2CH2OH
Explanation
The correct answer is CH3CH(OH)CH2CH3. In this Grignard reaction, the ethyl group from the Grignard reagent (CH3CH2MgBr) adds to the carbonyl carbon of ethanal (CH3CHO), forming a secondary alcohol after hydrolysis. The process involves the nucleophilic attack of the Grignard reagent on the carbonyl carbon, followed by protonation during the workup step. Options A, B, and D are incorrect as they either represent unreacted starting materials or products with incorrect structures not formed in this reaction.
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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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