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(C) When an ester $(RCOOR')$ reacts with a Grignard reagent $(R''MgX)$,the reaction proceeds in two steps. First,the Grignard reagent attacks the carb

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Tertiary alcohol

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(C) When an ester $(RCOOR')$ reacts with a Grignard reagent $(R''MgX)$,the reaction proceeds in two steps. First,the Grignard reagent attacks the carbonyl carbon of the ester to form a ketone intermediate $(R-CO-R'')$ and an alkoxide $(R'OMgX)$. Since the Grignard reagent is in excess,it immediately reacts with the newly formed ketone to produce an alkoxide intermediate. Finally,upon acidic hydrolysis,this intermediate yields a tertiary alcohol $(R-C(OH)(R'')_2)$.

The reaction between an ester and an excess of Grignard reagent $(R'MgX)$ finally results in a:

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