Methylmagnesium bromide cannot be used in ethanol as solvent because

1. Aethanol adds to magnesium to form a stable alkoxide complex without any gas evolution
2. Bethanol protonates the reagent to give methane, destroying the Grignard reagent
3. Cethanol undergoes ${\mathrm{S}}_{\mathrm{N}}2$ with the methyl carbon of the reagent
4. Dethanol is too nonpolar to dissolve the reagent