Acetone on addition to methyl magnesium bromide forms a complex, which on decomposition with acid gives $X$…

Acetone on addition to methyl magnesium bromide forms a complex, which on decomposition with acid gives $X$ and $\mathrm{Mg}(\mathrm{OH}) \mathrm{Br}$. Which one of the following is $X$ ?
  1. $\mathrm{CH}_3 \mathrm{OH}$
  2. $\left(\mathrm{CH}_3\right)_3 \mathrm{COH}$
  3. $\left(\mathrm{CH}_3\right)_2 \mathrm{CHOH}$
  4. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$

Asked in: AP EAMCET 2008

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