Grignard Reagent With Carbonyl
Mediumchemistry
CH₃MgBr + HCHO followed by H₃O⁺ gives:
Select the correct option:
Solution
Incorrect! Answer:
Ethanol
Grignard reagents (RMgX) react with carbonyl groups through nucleophilic addition.
- Formaldehyde (HCHO): Leads to Primary (1∘) alcohols.
- CH3−MgBr+H2C=O→CH3−CH2−OMgBr
- Hydrolysis: Adding acid (H3O+) protonates the alkoxide.
- CH3CH2OMgBr→CH3−CH2−OH (Ethanol).
- Note: Grignard + other aldehydes gives 2∘ alcohols; Grignard + ketones gives 3∘ alcohols.
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About This Question
- Subject
- chemistry
- Chapter
- organic compounds containing oxygen
- Topic
- grignard reagent with carbonyl
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Ethanol
Grignard reagents (RMgX) react with carbonyl groups through nucleophilic addition.
- Formaldehyde (HCHO): Leads to Primary (1∘) alcohols.
- CH3−MgBr+H2C=O→CH3−CH2−OMgBr
- Hydrolysis: Adding acid (H3O+) protonates the alkoxide.
- CH3CH2OMgBr→CH3−CH2−OH (Ethanol).
- Note: Grignard + other aldehydes gives 2∘ alcohols; Grignard + ketones gives 3∘ alcohols.
This medium difficulty chemistry question is from the chapter organic compounds containing oxygen, covering the topic of grignard reagent with carbonyl. It appeared in the 2025 exam.
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