Propanone is treated with CH3MgBr and the product is hydrolysed with H3O+. The alcohol obtained is

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Propanone is treated with $CH X_{3} MgBr$ and the product is hydrolysed with $H X_{3} O X^{+}$ . The alcohol obtained is

Ketones react with Grignard reagents to give tertiary alcohols.

(CH X_{3}) X_{2} C = O

plus

CH X_{3} MgBr

gives

(CH X_{3}) X_{3} C - OMgBr

, which on hydrolysis gives 2-methylpropan-2-ol.