A reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:

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1. **Reactants:** Acetone ($CH_3COCH_3$) is a ketone. Methylmagnesium chloride ($CH_3MgCl$) is a **Grignard reagent**. The preparation of Grignard reagents ($R-Mg-X$) is discussed in the Haloalkanes chapter .
2. **Mechanism:** Grignard reagents are strong nucleophiles. The alkyl group (methyl, $CH_3^-$) attacks the electrophilic carbonyl carbon of the acetone.
   - Reaction: $CH_3-C(=O)-CH_3 + CH_3-MgCl \rightarrow (CH_3)_3C-OMgCl$ (Adduct formation).
3. **Hydrolysis:** The intermediate adduct undergoes hydrolysis in the presence of water/acid to form an alcohol.
   - Reaction: $(CH_3)_3C-OMgCl + H_2O \rightarrow (CH_3)_3C-OH + Mg(OH)Cl$.
4. **Product:** The final product is $(CH_3)_3C-OH$, which is **tert-Butyl alcohol** (2-Methylpropan-2-ol). Reaction of Grignard reagents with ketones typically yields tertiary alcohols.

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