Grignard Reagent With Carbonyl

Question

CH₃MgBr + HCHO followed by H₃O⁺ gives:

RankGuru · Accepted Answer

Grignard reagents ($RMgX$) react with carbonyl groups through nucleophilic addition.
1. **Formaldehyde ($HCHO$)**: Leads to **Primary ($1^\circ$) alcohols**.
- $CH_3-MgBr + H_2C=O 	o CH_3-CH_2-OMgBr$
2. **Hydrolysis**: Adding acid ($H_3O^+$) protonates the alkoxide.
- $CH_3CH_2OMgBr 	o CH_3-CH_2-OH$ (**Ethanol**).
- Note: Grignard $+$ other aldehydes gives $2^\circ$ alcohols; Grignard $+$ ketones gives $3^\circ$ alcohols.

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Grignard Reagent With Carbonyl

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